參數(shù)資料
型號： FDC37C666GT
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(shù)： 123/152頁
文件大?。?/td> 621K
代理商： FDC37C666GT
123
CR3
This register can only be accessed when the
FDC is in the Configuration Mode and the
CSR has been initialized to 03H. The default
value after power up is 78H.
Table 50 - CR3
BIT NO.
0
1
BIT NAME
RESERVED
Enhanced
Floppy Mode
2
DESCRIPTION
Reserved - Read as zero
Bit 1
Floppy Mode - Refer to the description of the TAPE
DRIVE REGISTER (TDR) for more information on
these modes.
NORMAL Floppy Mode (Default)
Enhanced Floppy Mode 2 (OS2)
These two bits control the DRATE0 and DRATE1 outputs. The mapping
from the DRATE SEL bit of the DSR, DIR AND CCR to the DRATE
outputs is shown in Table 50 below. Defaults 1, 1 after power-up. If bit
1 = 1, then bits 3 and 4 become "don't cares".
0
1
3
Drive Opt 0
4
5
Drive Opt 1
MFM
IDENT is used in conjunction with MFM to define the interface mode of
operation.
6
IDENT
IDENT
1
1
0
0
MFM
1
0
1
0
MODE
AT Mode (Default)
Reserved
PS/2
Model 30
7,2
ADRx/
DRV2 EN/
PINTR
Bit 7
0
1
1
Bit 2
x
0
1
Pin 94
Input DRV2
ADDRX
PINTR2
Pin 39
PINTR
PINTR
High-Z
ADRx output/DRIVE 2 EN input: When set to a 1, this bit enables the
output. When cleared to a 0 (default) this bit allows the connection of the
Drive 2 indicator. Drive 2 is not available for the FDC37C666GT
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