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somewhat accurate baud rate delay simulator

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minjaesong
2025-05-06 13:22:09 +09:00
parent 480a3261a7
commit aaf074c7d6
2 changed files with 113 additions and 4 deletions
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72
terranmon.txt
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@@ -196,7 +196,9 @@ VRAM Bank 0 (256 kB)
Endianness: little
From the start of the memory space:
Memory Space
250880 bytes
Framebuffer
3 bytes
@@ -675,6 +677,9 @@ Sound Adapter
Endianness: little
Memory Space
0..114687 RW: Sample bin
114688..131071 RW: Instrument bin (256 instruments, 64 bytes each)
131072..196607 RW: Play data 1
@@ -833,3 +838,68 @@ MMIO
92..103 RW : DMA Lane 6 Props
104..115 RW : DMA Lane 7 Props
116..127 RW : DMA Lane 8 Props
--------------------------------------------------------------------------------
High Speed Disk Peripheral Adapter (HSDPA)
Endianness: Little
MMIO
0..2 RW: Block transfer status for Disk 1
0b nnnn nnnn, nnnn nnnn , a00z mmmm
n-read: size of the block from the other device, LSB (1048576-full block size is zero)
m-read: size of the block from the other device, MSB (1048576-full block size is zero)
a-read: if the other device hasNext (doYouHaveNext), false if device not present
z-read: set if the size is actually 0 instead of 1048576 (overrides n and m parameters)
n-write: size of the block I'm sending, LSB (1048576-full block size is zero)
m-write: size of the block I'm sending, MSB (1048576-full block size is zero)
a-write: if there's more to send (hasNext)
z-write: set if the size is actually 0 instead of 1048576 (overrides n and m parameters)
3..5 RW: Block transfer status for Disk 2
6..8 RW: Block transfer status for Disk 3
9..11 RW: Block transfer status for Disk 4
12..15 RW: Block transfer control for Disk 1 through 4
0b 0000 abcd
a: 1 for send, 0 for receive
b-write: 1 to start sending if a-bit is set; if a-bit is unset, make other device to start sending
b-read: if this bit is set, you're currently receiving something (aka busy)
c-write: I'm ready to receive
c-read: Are you ready to receive?
d-read: Are you there? (if the other device's recipient is myself)
NOTE: not ready AND not busy (bits b and d set when read) means the device is not connected to the port
16..19 RW: 8-bit status code for the disk
20 RW: Currently active disk (0: deselect all disk, 1: select disk #1, ...)
Selecting a disk will automatically unset and hold down "I'm ready to receive" flags of the other disks,
however, the target disk will NOT have its "I'm ready to receive" flag automatically set.
-- SEQUENTIAL IO SUPPORT MODULE --
NOTE: Sequential I/O will clobber the peripheral memory space.
256..257 RW: Sequential I/O control flags
258 RW: Opcode
0x00 - No operation
0x01 - Skip (arg 1) bytes
0x02 - Read (arg 1) bytes and store to core memory pointer (arg 2)
0x03 - Write (arg 1) bytes using data from the core memory from pointer (arg 2)
0xFF - Terminate sequential I/O session and free up the memory space
259..261 RW: Argument #1
262..264 RW: Argument #2
265..267 RW: Argument #3
268..270 RW: Argument #4
Memory Space
0..1048575 RW: Buffer for the block transfer lane