SPC7283 Epson Electronics America, Inc., SPC7283 Datasheet - Page 90

• Manufacturer Part Number: SPC7283
• Description: IEEE1394 Controller
• Manufacturer: Epson Electronics America, Inc.

S1R72803F00A
IDE Command Block Register
86
Address
0x70
0x71
0x72
0x73
0x74
0x75
0x76
0x77
This register is a Command Block Register that is the I/O port of the IDE interface.
The transfer mode of the Data Register is PIO mode-fixed, having access based on conditions set on the IDE_PioDmaCyc
Register. Since the setting at the BUS8/SWAP bit of the CONFIG Register is reflected, 16-bit access is possible by always
accessing the Data Register twice if it is 16 bits wide.
During DMA transfer, access to the Data Register is disabled.
If you access the 0x71-0x77 in the DMA mode or when the InterLock bit is not on, the HDMARQ is negated once and CPU
access is done.
When the Interlock bit is on or at the time of UltraDMA, the XHDMACK is negated at the time of HDMAQR off or on
completion of transfer. Note that, for this reason, the CPU access is put in wait state.
Register Name
IDE_CS00
IDE_CS01
IDE_CS02
IDE_CS03
IDE_CS04
IDE_CS05
IDE_CS06
IDE_CS07
7:
6:
5:
4:
3:
2:
1:
0:
7:
6:
5:
4:
3:
2:
1:
0:
7:
6:
5:
4:
3:
2:
1:
0:
7:
6:
5:
4:
3:
2:
1:
0:
7:
6:
5:
4:
3:
2:
1:
0:
7:
6:
5:
4:
3:
2:
1:
0:
7:
6:
5:
4:
3:
2:
1:
0:
7:
6:
5:
4:
3:
2:
1:
0:
Bit Symbol
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
EPSON
Command Block Register
Data Register
Command Block Register
Read : Error Register
Write: Features Register
Command Block Register
Sector Count Register
Command Block Register
Sector Number Register or
Logical Block Address(LBA) bit 0 – 7
Command Block Register
Cylinder Low Register or
Logical Block Address(LBA) bit 8 – 15
Command Block Register
Cylinder High Register or
Logical Block Address(LBA) bit 16 – 23
Command Block Register
Device/Head Register 0x00
Logical Block Address(LBA) bit 24 – 27
Command Block Register
Read : Status Register 0x00
Write: Command Register
Description
H.Rst S.Rst B.Rst
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
–
–
–
–
–
–
–
–