s1r72801 Epson Electronics America, Inc., s1r72801 Datasheet - Page 88
s1r72801
Manufacturer Part Number
s1r72801
Description
Ieee1394 Controller S1r72801f00a
Manufacturer
Epson Electronics America, Inc.
Datasheet
1.S1R72801.pdf
(113 pages)
- Current page: 88 of 113
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S1R72801F00A
IDE Byte Count Set Register
84
Address Register Name
0x6A
0x6B
0x68
0x69
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).
IDE_ByteCount0 7: ByteCount[31]
IDE_ByteCount1 7: ByteCount[23]
IDE_ByteCount2 7: ByteCount[15]
IDE_ByteCount3 7: ByteCount[7]
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]
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]
Bit Symbol
R/W
R/W
EPSON
IDE Data Transfer Byte Count Register
Read: Indicate Remain Byte Count
Write: Set Total Transfer Byte Count
Description
H.Rst S.Rst B.Rst
0x00 0x00
0x00 0x00
0x00 0x00
0x00 0x00
–
–
–
–
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