參數(shù)資料
型號: 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I / O軟盤控制器與紅外線支持
文件頁數(shù): 30/164頁
文件大?。?/td> 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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