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參數資料
型號: W83759A
廠商: WINBOND ELECTRONICS CORP
英文描述: ADVANCED VL-IDE DISK CONTROLLER
中文描述: 先進的VL - IDE磁盤控制器
文件頁數: 29/41頁
文件大小: 334K
代理商: W83759A
W83759A
Publication Release Date: May 1995
- 29 -
Revision A1
b. CPU READ CYCLES
Table 3. W83759A Read Data Operation
BYTE ENABLE
W83759A OUTPUT DATA
HD[31:16]
HD[15:0]
×
×
×
×
×
Valid
I/O ADDRESS
BE3
1
1
1
0
1
0
BE2
1
1
0
1
1
0
BE1
1
0
1
1
0
0
BE0
0
1
1
1
0
0
SD[7:0]
Valid
Valid
Valid
Valid
×
×
×
×
×
×
1F1
1F7 (171
177)
Valid
Valid
1F0 (170)
8-bit IDE Read Data Path:
CPU
Valid HD Byte
Chip Set
SD[7:0]
W83759A
ID[7:0]
16/32-bit IDE Read Data Path:
CPU
Valid HD Word
W83759A
ID[15:0]
Drive Interface
The W83759A is designed to work with standard IDE disk drives. For the IDE interface, the W83759A
provides a 16-bit data path ID[15;0], address lines IDEA[2:0], decoded device select signals
IDE0CS0
(IDE1CS0) and
IDE0CS1
(
IDE1CS1
), and decoded command sigals
IDEIOR
and
IDEIOW
.
During normal operation, the drive address outputs IDEA[2:0] are used to select a register in an IDE
drive. These addresses are generated from
BE2
,
BE0
, HA2 and SA1, SA0. Table 4 summarizes the
type enable decoding for normal operation.
Table 4. IDEA[2:0] Generation
HA2
0
0
0
0
0
1
1
1
1
BE2
1
0
×
×
×
×
×
×
×
BE0
0
0
×
×
×
×
×
×
×
SA1
×
×
0
1
1
0
0
1
1
SA0
×
×
1
0
1
0
1
0
1
IDEA[2:0]
000
000
001
010
011
100
101
110
111
I/O ADDRESS
1F0 (170) 16-bit
1F0 (170) 32-bit
1F1 (171)
1F2 (172)
1F3 (173)
1F4 (174)
1F5 (175)
1F6 (176)
1F7 (177)
Two drive chip select signals,
IDE0CS0
(
IDE1CS0
) and
IDE0CS1
(
IDE1CS1
), are generated from
the local bus addresses and ISA bus address. The 16-bit data register may be read or written at I/O
address 1F0h(170h). The 8-bit IDE command and status registers are at I/O addresses 1F1h through
1F7h (and 171h through 177h). The
IDEIOR
or
IDEIOW
commands are generated for all address
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