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參數資料
型號: W88227QD
廠商: WINBOND ELECTRONICS CORP
元件分類: 消費家電
英文描述: ATAPI CD-ROM Decoder(支持ATAPI標準的CD-ROM解碼器)
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP128
封裝: LQFP-128
文件頁數: 15/116頁
文件大小: 787K
代理商: W88227QD
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 11 -
1999/10/1 Rev: 0.70
2.1.4 Multi-function Pins
The state of general-purpose I/O pins can be controlled through register
GIOCTL (5Fh)
.
2.1.4.1 GPIO1/nFWE Configuration
If the
IDE Programming Ready Signature (E8)
is high by executing the IDE programming sequence, this pin is
used as nFWE. Otherwise, this pin is used as GPIO1.
2.1.4.2 GPIO2/DAOUT/nFCE Configuration
G2CF (5Dh.3)
DAOEN (87h.7)
pin function
Remark
0b
0b
nFCE
(default)
1b
0b
GPIO2
x
1b
DAOUT
This pin is configured as nFCE and output "low" after master reset. It holds "high" when uP enter power-
down mode by setting
PD (PCON.1)
high and returns to low active status when:
1. Hardware reset,
2. Software reset if
HIIEN (2Eh.w7)
is set high,
3. or DEVICE RESET command if
ARSTIEN (2Fh.w1)
is set high.
This function can be utilized to save power of external ROM in Sleep mode.
If a pull-down resistor is connected to pin RA4, the pin is configured as GPIO2 after master reset. If
DAOEN
(87h.7)
is set high, this pin is used as DAOUT, digital audio output.
2.1.4.3 GPIO3/nCCS1 Configuration
The value of CCSA1 (41h) is 00h after master reset.
G3CF (5Dh.2-0)
Function
nCCS1 active (low) condition
Remark
0xxb
GPIO3
n/a
Default
100b
nCCS1
(P2 = CCSA1)
101b
nCCS1
(P2 = CCSA1) & (P36 = "L")
110b
nCCS1
(P2 = CCSA1) & (P37 = "L")
111b
nCCS1
(P2 = CCSA1) & (P36 = "L" or P37 = "L")
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