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--- title: GPUSTAT DMA Bits type: test summary: Reads the DMA request and ready bits of GPUSTAT around a draw in each DMA direction. category: Hardware tests info: Machine = SCPH-5501 info: Program = gpu/gpustat (ps1-tests) --- ## Overview The program draws by CPU writes to GP0 and by a [DMA](/hardware/dma/) list. It also draws by DMA in sync mode 1 with GP1(04h) direction 1 (FIFO) and with direction 2 (CPU to GP0). Before, during and after each draw it checks bits 25 to 30 of [GPUSTAT](/hardware/gpu/gpustat/) against its own expected values.[^src] The bits it checks are bit 25 (DMA request), bit 26 (ready to receive a command word), bit 27 (ready to send VRAM to the CPU), bit 28 (ready to receive a DMA block) and bits 29 and 30 (DMA direction).[^run] ## Results In the runs from 27 September 2026 on, the SCPH-5501 passed all 13 checks.[^run] In the run of 25 September 2026 the check during a sync mode draw with direction 2 failed. GPUSTAT read bit 25 set (02000000h) and bit 28 set (10000000h), where the test expected both clear. The other 12 checks passed in that run.[^run] ## Runs ### 25 September 2026 [07GST.txt](/tests/raw/20260925T0000Z-5501a-card-main/main/07GST.txt) ``` ===== 07 GST GPU GPUSTAT | BIOS 19951204 System ROM Version 3.0 11/18/96 A gpu/gpustat Bits in GPUSTAT description: Bit 25 - DMA Request - When DMA Direction == 0 (Off) - always 0 - When DMA Direction == 1 (FIFO) - ? - When DMA Direction == 2 (CPUtoGP0) - same as Bit 28 - When DMA Direction == 3 (GPUREADtoCPU) - same as Bit 27 Bit 26 - Ready to receive Cmd Word Bit 27 - Ready to send VRAM to CPU Bit 28 - Ready to receive DMA Block Bits 29-30 - DMA Direction (0 - Off, 1 - FIFO, 2 - CPUtoGP0, 3 - GPUREADtoCPU) pass - testGpustat_CPU_beforeRender pass - testGpustat_CPU_duringRender pass - testGpustat_CPU_afterRender pass - testGpustat_linkedListDMA_beforeRender pass - testGpustat_LinkedListDMA_duringRender pass - testGpustat_LinkedListDMA_afterRender pass - testGpustat_SyncModeDMA_dir1_beforeRender pass - testGpustat_SyncModeDMA_dir1_duringRender pass - testGpustat_SyncModeDMA_dir1_afterRender pass - testGpustat_SyncModeDMA_dir2_beforeRender fail - testGpustat_SyncModeDMA_dir2_duringRender:254 `(stat) & (1 << 25) == 0 << 25`, given: 0x2000000, expected: 0x0 fail - testGpustat_SyncModeDMA_dir2_duringRender:257 `(stat) & (1 << 28) == 0 << 28`, given: 0x10000000, expected: 0x0 pass - testGpustat_SyncModeDMA_dir2_afterRender Done. ``` ### 27 September 2026 [07GST.txt](/tests/raw/20260927T0000Z-5501a-card-2/main/s024/07GST.txt) ``` ===== 07 GST GPU GPUSTAT | BIOS 19951204 System ROM Version 3.0 11/18/96 A gpu/gpustat Bits in GPUSTAT description: Bit 25 - DMA Request - When DMA Direction == 0 (Off) - always 0 - When DMA Direction == 1 (FIFO) - ? - When DMA Direction == 2 (CPUtoGP0) - same as Bit 28 - When DMA Direction == 3 (GPUREADtoCPU) - same as Bit 27 Bit 26 - Ready to receive Cmd Word Bit 27 - Ready to send VRAM to CPU Bit 28 - Ready to receive DMA Block Bits 29-30 - DMA Direction (0 - Off, 1 - FIFO, 2 - CPUtoGP0, 3 - GPUREADtoCPU) pass - testGpustat_CPU_beforeRender pass - testGpustat_CPU_duringRender pass - testGpustat_CPU_afterRender pass - testGpustat_linkedListDMA_beforeRender pass - testGpustat_LinkedListDMA_duringRender pass - testGpustat_LinkedListDMA_afterRender pass - testGpustat_SyncModeDMA_dir1_beforeRender pass - testGpustat_SyncModeDMA_dir1_duringRender pass - testGpustat_SyncModeDMA_dir1_afterRender pass - testGpustat_SyncModeDMA_dir2_beforeRender pass - testGpustat_SyncModeDMA_dir2_duringRender pass - testGpustat_SyncModeDMA_dir2_afterRender Done. ``` ### 27 September 2026 run 2 [07GST.txt](/tests/raw/20260927T0000Z-5501a-card-b/main/s034/07GST.txt) ``` ===== 07 GST GPU GPUSTAT | BIOS 19951204 System ROM Version 3.0 11/18/96 A gpu/gpustat Bits in GPUSTAT description: Bit 25 - DMA Request - When DMA Direction == 0 (Off) - always 0 - When DMA Direction == 1 (FIFO) - ? - When DMA Direction == 2 (CPUtoGP0) - same as Bit 28 - When DMA Direction == 3 (GPUREADtoCPU) - same as Bit 27 Bit 26 - Ready to receive Cmd Word Bit 27 - Ready to send VRAM to CPU Bit 28 - Ready to receive DMA Block Bits 29-30 - DMA Direction (0 - Off, 1 - FIFO, 2 - CPUtoGP0, 3 - GPUREADtoCPU) pass - testGpustat_CPU_beforeRender pass - testGpustat_CPU_duringRender pass - testGpustat_CPU_afterRender pass - testGpustat_linkedListDMA_beforeRender pass - testGpustat_LinkedListDMA_duringRender pass - testGpustat_LinkedListDMA_afterRender pass - testGpustat_SyncModeDMA_dir1_beforeRender pass - testGpustat_SyncModeDMA_dir1_duringRender pass - testGpustat_SyncModeDMA_dir1_afterRender pass - testGpustat_SyncModeDMA_dir2_beforeRender pass - testGpustat_SyncModeDMA_dir2_duringRender pass - testGpustat_SyncModeDMA_dir2_afterRender Done. ``` ### 27 September 2026 run 3 [07GST.txt](/tests/raw/20260927T0000Z-5501a-card-g/main/07GST.txt) ``` ===== 07 GST GPU GPUSTAT | BIOS 19951204 System ROM Version 3.0 11/18/96 A gpu/gpustat Bits in GPUSTAT description: Bit 25 - DMA Request - When DMA Direction == 0 (Off) - always 0 - When DMA Direction == 1 (FIFO) - ? - When DMA Direction == 2 (CPUtoGP0) - same as Bit 28 - When DMA Direction == 3 (GPUREADtoCPU) - same as Bit 27 Bit 26 - Ready to receive Cmd Word Bit 27 - Ready to send VRAM to CPU Bit 28 - Ready to receive DMA Block Bits 29-30 - DMA Direction (0 - Off, 1 - FIFO, 2 - CPUtoGP0, 3 - GPUREADtoCPU) pass - testGpustat_CPU_beforeRender pass - testGpustat_CPU_duringRender pass - testGpustat_CPU_afterRender pass - testGpustat_linkedListDMA_beforeRender pass - testGpustat_LinkedListDMA_duringRender pass - testGpustat_LinkedListDMA_afterRender pass - testGpustat_SyncModeDMA_dir1_beforeRender pass - testGpustat_SyncModeDMA_dir1_duringRender pass - testGpustat_SyncModeDMA_dir1_afterRender pass - testGpustat_SyncModeDMA_dir2_beforeRender pass - testGpustat_SyncModeDMA_dir2_duringRender pass - testGpustat_SyncModeDMA_dir2_afterRender Done. ``` ### 27 September 2026 run 4 [07GST.txt](/tests/raw/20260927T0000Z-5501a-card-g3/main/07GST.txt) ``` ===== 07 GST GPU GPUSTAT | BIOS 19951204 System ROM Version 3.0 11/18/96 A gpu/gpustat Bits in GPUSTAT description: Bit 25 - DMA Request - When DMA Direction == 0 (Off) - always 0 - When DMA Direction == 1 (FIFO) - ? - When DMA Direction == 2 (CPUtoGP0) - same as Bit 28 - When DMA Direction == 3 (GPUREADtoCPU) - same as Bit 27 Bit 26 - Ready to receive Cmd Word Bit 27 - Ready to send VRAM to CPU Bit 28 - Ready to receive DMA Block Bits 29-30 - DMA Direction (0 - Off, 1 - FIFO, 2 - CPUtoGP0, 3 - GPUREADtoCPU) pass - testGpustat_CPU_beforeRender pass - testGpustat_CPU_duringRender pass - testGpustat_CPU_afterRender pass - testGpustat_linkedListDMA_beforeRender pass - testGpustat_LinkedListDMA_duringRender pass - testGpustat_LinkedListDMA_afterRender pass - testGpustat_SyncModeDMA_dir1_beforeRender pass - testGpustat_SyncModeDMA_dir1_duringRender pass - testGpustat_SyncModeDMA_dir1_afterRender pass - testGpustat_SyncModeDMA_dir2_beforeRender pass - testGpustat_SyncModeDMA_dir2_duringRender pass - testGpustat_SyncModeDMA_dir2_afterRender Done. ``` ### 28 September 2026 [07GST.txt](/tests/raw/20260928T0000Z-5501a-card-h/main/07GST.txt) ``` ===== 07 GST GPU GPUSTAT | BIOS 19951204 System ROM Version 3.0 11/18/96 A gpu/gpustat Bits in GPUSTAT description: Bit 25 - DMA Request - When DMA Direction == 0 (Off) - always 0 - When DMA Direction == 1 (FIFO) - ? - When DMA Direction == 2 (CPUtoGP0) - same as Bit 28 - When DMA Direction == 3 (GPUREADtoCPU) - same as Bit 27 Bit 26 - Ready to receive Cmd Word Bit 27 - Ready to send VRAM to CPU Bit 28 - Ready to receive DMA Block Bits 29-30 - DMA Direction (0 - Off, 1 - FIFO, 2 - CPUtoGP0, 3 - GPUREADtoCPU) pass - testGpustat_CPU_beforeRender pass - testGpustat_CPU_duringRender pass - testGpustat_CPU_afterRender pass - testGpustat_linkedListDMA_beforeRender pass - testGpustat_LinkedListDMA_duringRender pass - testGpustat_LinkedListDMA_afterRender pass - testGpustat_SyncModeDMA_dir1_beforeRender pass - testGpustat_SyncModeDMA_dir1_duringRender pass - testGpustat_SyncModeDMA_dir1_afterRender pass - testGpustat_SyncModeDMA_dir2_beforeRender pass - testGpustat_SyncModeDMA_dir2_duringRender pass - testGpustat_SyncModeDMA_dir2_afterRender Done. ``` ## References [^src]: ps1-tests, gpu/gpustat. https://github.com/JaCzekanski/ps1-tests. [^run]: SCPH-5501 output: [main/07GST.txt](/tests/raw/20260925T0000Z-5501a-card-main/main/07GST.txt) and the files beside it, with the other runs listed under Runs.