FDC37N769_07 SMSC [SMSC Corporation], FDC37N769_07 Datasheet - Page 100

• Manufacturer Part Number: FDC37N769_07
• Description: 3.3V Super I/O Controller with Infrared Support for Portable Applications
• Manufacturer: SMSC [SMSC Corporation]

CR04
CR04 can only be accessed in the configuration state and after the CSR has been initialized to 04H. The default
value after power up is 00H (Table 80).
Note
Note
Note
Note
SMSC DS – FDC37N769
2
3
4
1
:
:
:
:
In this mode, EPP can be selected through the ecr register of ECP as mode 100.
In these modes, 2 drives can be supported directly, 3 or 4 drives must use external 4 drive support.
SPP can be selected through the ecr register of ECP as mode 000.
MIDI Support: The Musical Instrumental Digital Interface (MIDI) operates at
31.25Kbaud (+/-1%) which can be derived from 125KHz. (24 MHz/12=2 MHz, 2
MHz/16=125 KHz).
The function of this bit has been modified from the FDC37C669. This bit’s former
function, the selection of the pins for IR receive and transmit, has been moved to
CR0A.
NO.
BIT
1,0
2,3
4
5
6
7
Parallel
Port
Extended
Modes
Parallel
Port FDC
MIDI 1
MIDI 2
EPP Type
Reserved
BIT NAME
3
3
4
Table 80 - CR04: Parallel and Serial Extended Setup Register
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.
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.
0 = EPP 1.9 (default)
1 = EPP 1.7
Reserved - Read as 0.
Bit 1
Bit 3
0
0
1
1
0
0
1
1
DATASHEET
Bit 0
Bit 2
0
1
0
1
0
1
0
1
Page 100 of 137
If CR1 bit 3 is a low level then:
Standard and Bi-directional Modes (SPP) (default)
EPP Mode and SPP
ECP Mode
ECP Mode & EPP Mode
Normal
PPFD1
PPFD2
Reserved
DESCRIPTION
2
1,2
Rev. 02-16-07