FDC37C665IR SMSC Corporation, FDC37C665IR Datasheet - Page 128
FDC37C665IR
Manufacturer Part Number
FDC37C665IR
Description
3/5 Volt Advanced High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controller with Infranred Support
Manufacturer
SMSC Corporation
Datasheet
1.FDC37C665IR.pdf
(162 pages)
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CR4
This register can only be accessed when the
FDC is in the Configuration Mode and the
Note CR4_1: In this mode, EPP can be selected through the ecr register of ECP as mode 100.
Note CR4_2: In these modes, 2 drives can be supported directly, 3 or 4 drives must use external 4
Note CR4_3: MIDI Support: The Musical Instrumental Digital Interface (MIDI) operates at 31.25Kbaud
BIT NO.
1,0
2,3
4
5
6
7
drive support! SPP can be selected through the ecr register of ECP as mode 000.
(+/-1%) which can be derived from 125KHz. (24MHz/12=2MHz, 2MHz/16=125KHz).
Parallel Port
Extended Modes
Parallel Port
FDC
MIDI 1
MIDI 2
EPP Type
RESR
Table 54 - CR4 - Parallel and Serial Extended Setup Register
BIT NAME
Refer to Parallel Port Floppy Disk Controller description.
Serial Clock Select Port 1: A low level on this bit, disables MIDI
support, clock = divide by 13 (Default). A high level on this bit
enables MIDI support, clock = divide by 12. (Note CR4_3)
Serial Clock Select Port 2: A low level on this bit, disables MIDI
support, clock = divide by 13 (Default). A high level on this bit
enables MIDI support, clock = divide by 12. (Note CR4_3)
0 = EPP 1.9 (Default)
1 = EPP 1.7
(This bit is Reserved - set/read as '0').
Bit 1
Bit 3
0
0
1
1
0
0
1
1
Bit 0
Bit 2
128
0
1
0
1
0
1
0
1
CSR has been initialized to 04H. The default
value after power up is 00H.
If CR1 bit 3 is a low level then:
Standard and Bidirectional Modes (SPP)
(Default)
EPP Mode and SPP
ECP Mode (Note CR4_2)
ECP Mode & EPP Mode (Note CR4_1, 2)
Normal
PPFD1
PPFD2
Reserved
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