參數(shù)資料
型號(hào): 37C669
廠商: SMSC Corporation
英文描述: DIODE SCHOTTKY SINGLE 25V 200mW 0.5V-vf 200mA-IFM 30mA-IF 2uA-IR SOD-323 3K/REEL
中文描述: 電腦98/99順從超級(jí)I / O軟盤控制器與紅外線支持
文件頁數(shù): 29/164頁
文件大?。?/td> 621K
代理商: 37C669
124
CR04
This register can only
be
accessed
in the
Configuration Mode and the CSR has been
initialized to 04H. The default value after power
up is 00H.
Table 51 - CR04 - Parallel and Serial Extended Setup Register
BIT NO.
BIT NAME
DESCRIPTION
1,0
Parallel Port
Extended Modes
Bit 1
Bit 0
If CR1 bit 3 is a low level then:
0
Standard and Bidirectional Modes (SPP)
(Default)
0
1
EPP Mode and SPP
1
0
ECP Mode (Note CR4_2)
1
ECP Mode & EPP Mode (Note CR4_1, 2)
2,3
Parallel Port
FDC
Refer to Parallel Port Floppy Disk Controller description.
Bit 3
Bit 2
0
Normal
0
1
PPFD1
1
0
PPFD2
1
Reserved
4
MIDI 1
Serial Clock Select Port 1: A low level on this bit, disables MIDI
support, clock = divide by 13 (Default). A high level on this bit
enables MIDI support, clock = divide by 12. (Note CR4_3)
5
MIDI 2
Serial Clock Select Port 2: A low level on this bit, disables MIDI
support, clock = divide by 13 (Default). A high level on this bit
enables MIDI support, clock = divide by 12. (Note CR4_3)
6
EPP Type
0 = EPP 1.9 (Default)
1 = EPP 1.7
7
ALT I/O
1 = use pins IRRX2, IRTX2 (pins 25, 26)
0 = use pins IRRX, IRTX (Default) (pins 88, 89)
note: If this bit is set, the Infrared receive and transmit functions
will not be available on pins 25 and 26 unless
bits [0,1] of CR00 are set to [1,1].
Note CR4_1:
In this mode, EPP can be selected through the ecr register of ECP as mode 100.
Note CR4_2:
In these modes, 2 drives can be supported directly, 3 or 4 drives must use external 4 drive
support. SPP can be selected through the ecr register of ECP as mode 000.
Note CR4_3:
MIDI Support: The Musical Instrumental Digital Interface (MIDI) operates at 31.25Kbaud (+/-1%)
which can be derived from 125KHz. (24MHz/12=2MHz, 2MHz/16=125kHz).
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