Epson S1R75801F00A Technical Manual page 88

S1R72803F00A
Address Register Name
0x68 IDE_ByteCount0 7: ByteCount[31]
0x69 IDE_ByteCount1 7: ByteCount[23]
0x6A IDE_ByteCount2 7: ByteCount[15]
0x6B IDE_ByteCount3 7: ByteCount[7]
IDE Byte Count Set Register
This register sets a total data length in DMA transfer in the unit of byte. By setting each register of
IDE_ByteCount0 to 3, setting up to max. 0xFFFFFFFF is possible.
If you set an odd byte to this register or the OddStart bit of the CONFIG0 Register when using the data port of
the IDE bus based on word size, 1 byte is short at the first or last transfer. It is automatically padded by the IC
(data is undefined).
84
Bit Symbol R/W
6: ByteCount[30]
5: ByteCount[29]
4: ByteCount[28]
3: ByteCount[27]
2: ByteCount[26]
1: ByteCount[25]
0: ByteCount[24]
6: ByteCount[22]
5: ByteCount[21]
4: ByteCount[20]
3: ByteCount[19]
2: ByteCount[18] R/W
1: ByteCount[17]
0: ByteCount[16]
6: ByteCount[14]
5: ByteCount[13]
4: ByteCount[12]
3: ByteCount[11]
2: ByteCount[10]
1: ByteCount[9]
0: ByteCount[8]
6: ByteCount[6]
5: ByteCount[5]
4: ByteCount[4]
3: ByteCount[3]
2: ByteCount[2]
1: ByteCount[1]
0: ByteCount[0]
Description
IDE Data Transfer Byte Count Register
Read: Indicate Remain Byte Count
Write: Set Total Transfer Byte Count
EPSON
H.Rst S.Rst B.Rst
0x00 0x00 –
0x00 0x00 –
0x00 0x00 –
0x00 0x00 –