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): 84/164頁
文件大?。?/td> 621K
代理商: 37C669
26
Normal Floppy Mode
Normal mode.
Register 3F3 contains only bits 0 and 1. When this register is read, bits 2 - 7 are a
high impedance.
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
REG 3F3
Tri-state
tape sel1
tape sel0
Enhanced Floppy Mode 2 (OS2)
Register 3F3 for Enhanced Floppy Mode 2 operation.
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
REG 3F3 Reserved Reserved
Drive Type ID
Floppy Boot Drive
tape sel1
tape sel0
For this mode, DRATE0 and DRATE1 pins are
inputs, and these inputs are gated into bits 6
and 7 of the 3F3 register. These two bits are
not affected by a hard or soft reset.
BIT 7 Reserved
BIT 6 Reserved
BITS 5 and 4 Drive Type ID - These Bits reflect
two of the bits of configuration register 6.
Which two bits depends on the last drive
selected in the Digital Output Register (3F2).
(See Table 11)
BITS 3 and 2 Floppy Boot Drive - These bits
reflect the value of configuration register 7 bits
1, 0. Bit 3 = CR7 Bit DB1. Bit 2 = CR7 Bit DB0.
Bits
1
and
0
-
Tape
Drive
Select
(READ/WRITE).
Same
as
in
Normal
and
Enhanced Floppy Mode. 1.
Table 9 - Drive Type ID
Digital Output Register
Register 3F3 - Drive Type ID
Bit 1
Bit 0
Bit 5
Bit 4
0
CR6 - Bit 1
CR6 - Bit 0
0
1
CR6 - Bit 3
CR6 - Bit 2
1
0
CR6 - Bit 5
CR6 - Bit 4
1
CR6 - Bit 7
CR6 - Bit 6
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