参数资料
型号: 37C669
厂商: 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: 电脑98/99顺从超级I / O软盘控制器与红外线支持
文件页数: 30/164页
文件大小: 621K
代理商: 37C669
125
CR05
This register can only be accessed in the
Configuration Mode and the CSR has been
initialized to 05H. The default value after power
up is 00H.
Table 52 - CR05- Floppy Disk and IDE Extended Setup Register
BIT NO.
BIT NAME
DESCRIPTION
0,1
Reserved
Read Only. A read returns a 0.
2
FDC DMA Mode
0=(default) Burst mode is enabled for the FDC FIFO execution
phase data transfers. 1=Non-Burst mode enabled. The FDRQ
and FIRQ pins are strobed once for each byte transferred while
the FIFO is enabled.
4,3
DenSel
Bit 4
Bit 3
Densel output
0
Normal (Default)
0
1
Reserved
1
0
1
0
5
Swap Drv 0,1
A high level on this bit, swaps drives and motor sel 0 and 1 of the
FDC. A low level on this bit does not (Default).
6
EXTx4
External 4 drive support: 0=Internal 2 drive decoder (default).
1=External 4 drive decoder (External 2 to 4 decoder required).
7
Reserved
Read Only. A read of this bit returns a 0
CR06
This register can only be accessed in the
Configuration Mode and after the CSR has
been initialized to 06H.
The default value
of this register after power up is FFH. This
register holds the floppy disk drive types for up
to four floppy disk drives.
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