參數資料
型號: FDC37C665GT
廠商: STANDARD MICROSYSTEMS CORP
元件分類: 存儲控制器/管理單元
英文描述: High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controllers
中文描述: 1 Mbps, IDE COMPATIBLE, FLOPPY DISK DRIVE CONTROLLER, PQFP100
封裝: QFP-100
文件頁數: 128/162頁
文件大?。?/td> 562K
代理商: FDC37C665GT
128
CR4
This register can only be accessed when the
FDC is in the Configuration Mode and the
CSR has been initialized to 04H. The default
value after power up is 00H.
Table 54 - CR4 - Parallel and Serial Extended Setup Register
BIT NAME
Parallel Port
Extended Modes
0
BIT NO.
1,0
DESCRIPTION
If CR1 bit 3 is a low level then:
Bit 1
Bit 0
0
Standard and Bidirectional Modes (SPP)
(Default)
EPP Mode and SPP
ECP Mode (Note CR4_2)
ECP Mode & EPP Mode (Note CR4_1, 2)
Refer to Parallel Port Floppy Disk Controller description.
0
1
1
1
0
1
2,3
Parallel Port
FDC
Bit 3
0
0
1
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)
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)
0 = EPP 1.9 (Default)
1 = EPP 1.7
(This bit is Reserved - set/read as '0').
Bit 2
0
1
0
1
Normal
PPFD1
PPFD2
Reserved
4
MIDI 1
5
MIDI 2
6
EPP Type
7
RESR
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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