LPC47U33X View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
LPC47U33X
SMSC -> Microchip
'LPC47U33X' PDF : 252 Pages View PDF
Table 7 - Internal 2 Drive Decode - Normal
DIGITAL OUTPUT
REGISTER
DRIVE SELECT
MOTOR ON OUTPUTS
OUTPUTS (ACTIVE LOW)
(ACTIVE LOW)
Bit 5 Bit 4 Bit1 Bit 0
nDS1
nDS0
nMTR1
nMTR0
X
1
0
0
1
0
nBIT 5
nBIT 4
1
X
0
1
0
1
nBIT 5
nBIT 4
0
0
X
X
1
1
nBIT 5
nBIT 4
Table 8 - Internal 2 Drive Decode - Drives 0 and 1 Swapped
DIGITAL OUTPUT
REGISTER
DRIVE SELECT
MOTOR ON OUTPUTS
OUTPUTS (ACTIVE LOW)
(ACTIVE LOW)
Bit 5 Bit 4 Bit1 Bit 0
nDS1
nDS0
nMTR1
nMTR0
X
1
0
0
0
1
nBIT 4
nBIT 5
1
X
0
1
1
0
nBIT 4
nBIT 5
0
0
X
X
1
1
nBIT 4
nBIT 5
Normal Floppy Mode
Normal mode. Register 3F3 contains only bits 0 and 1. When this register is read, bits 2 - 7 are ‘0’.
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
REG 3F3
0
0
0
0
0
0
tape sel1 tape sel0
Enhanced Floppy Mode 2 (OS2)
Register 3F3 for Enhanced Floppy Mode 2 operation.
DB7
DB6
REG 3F3 Reserved Reserved
DB5
DB4
Drive Type ID
DB3
DB2
DB1
DB0
Floppy Boot Drive tape sel1 tape sel0
Note:
Table 9 - Drive Type ID
DIGITAL OUTPUT REGISTER
REGISTER 3F3 - DRIVE TYPE ID
Bit 1
Bit 0
Bit 5
Bit 4
0
0
L0-CRF2 - B1
L0-CRF2 - B0
0
1
L0-CRF2 - B3
L0-CRF2 - B2
1
0
L0-CRF2 - B5
L0-CRF2 - B4
1
1
L0-CRF2 - B7
L0-CRF2 - B6
L0-CRF2-Bx = Logical Device 0, Configuration Register F2, Bit x.
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