FDC37C669-MT SMSC, FDC37C669-MT Datasheet - Page 134

• Manufacturer Part Number: FDC37C669-MT
• Description: IC CTRLR SUPER I/O FLPPY 100TQFP
• Manufacturer: SMSC

Specifications of FDC37C669-MT

• Controller Type: I/O Controller
• Interface: ISA Host
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 25mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1008

CR27
This register can only be accessed in the Configuration
Mode and after the CSR has been initialized
The default value of this register after power up is 00H.
This register is used to select the IRQ for the FDC (Bits
4:7) and the parallel port (bits 3:0). Any unselected IRQ
output (registers CR27-CR29) is in tristate.
CR28
This register can only be accessed in the Configuration
Mode and after the CSR has been initialized to 28H. The
default value of this register after power up is 00H. This
register
CR29
This register can only be accessed in the Configuration
Mode and after the CSR has been initialized to 29H. The
default value of this register after power up is 00H. This
register
D3-D0 or
D7-D4
0000
0001
0010
0011
0100
0101
0110
0111
1000
to
27H.
is
is
134
IRQ Selected
used to select the IRQ for serial port 1 (bits 7:4) and for
serial port 2 (bits 3:0). Refer to IRQ Table for CR27. Any
unselected IRQ output (registers CR27 - CR29) is in
tristate.
To properly share an IRQ among UART1 and UART2:
1)
2)
used to select the IRQ for IRQIN (bits 3:0). Refer to IRQ
Table for CR27. Bits 7:4 are reserved and return zero
CR27-CR29) is in tristate.
when read.
Reserved
IRQ_C
IRQ_D
IRQ_H
IRQ_A
IRQ_B
IRQ_E
IRQ_F
None
Configure UART1 to use the desired IRQ pin.
Set UART2 to 0Fh i.e., set CR28 bits[3:0]=1111.
to Table 60 on the following page:
This selects the share IRQ mechanism. Refer
Any unselected IRQ output (registers