2-54
Service Guide
Table 2-6
FDC37C67 Pin Descriptions
Pin No./QFP
Pin Name
Type
Symbol
Buffer Type
78
Paper End
1
PE
I
77
Printer Selected
1
SLCT
I
81
Error at Printer
1
nERROR
I
Keyboard/Mouse Interface (6)
56
Keyboard Data .
1
KDAT
IOD16P
57
Keyboard Clock
1
KCLK
IOD16P
58
Mouse Data
1
MDAT
IOD16P
59
Mouse Clock
1
MCLK
IOD16P
63
Keyboard Reset
1
KBDRST(Note 3)
O4
64
Gate A20
1
A20M
O4
Note 0: The interrupt request is output on one of the IRQx signals as an 024 buffer type. If EPP or ECP
Mode is enabled, this output is pulsed low, then released to allow sharing of interrupts. In this case, the
buffer type is OD24. Refer to the configuration section for more information.
Note 1: For 1 2it addressing, SAO:SA11 only, nCS should be tied to GND. For 1 6it external address
qualification, address bits SA11:SA15 can be "ORed" together and applied to nCS. The nCS pin functions
as SA11 in full 1 6it Internal Address Qualification Mode.CR24.6 controls the FDC37C67x addressing
modes.
Note 2: The "n" as the first letter of a signal name indicates an "Active Low" signal.
Note 3: KBDRST is active low.
BUFFER TYPE DESCRIPTIONS
•
I
Input, TTL compatible.
•
IS
Input with Schmitt trigger.
•
IOD16P
Input/Output, 1 6mA sink, 90uA pullup. 0
•
IO24
Input/Output, 24mA sink, 1 2mA source.
•
IO4
Input/Output, 4mA sink, 2mA source.
•
O4
Output, 4mA sink, 2mA source.
•
O24
Output, 24mA sink, 1 2mA source.
•
OD24
Output, Open Drain, 24mA sink.
•
ICLK
Clock Input
Summary of Contents for 390 Series
Page 15: ...System Introduction 1 3 Figure 1 2 PCB No 96183 1A Mainboard Layout Bottom ...
Page 96: ...2 50 Service Guide 2 3 3 Pin Configuration Figure 2 4 FDC37C67 TQFP Pin Diagram ...
Page 97: ...Major Chips Description 2 51 Figure 2 5 FDC37C67 QFP Pin Diagram ...
Page 102: ...2 56 Service Guide 2 3 6 Block Diagram Figure 2 6 FDC37C67 Block Diagram ...
Page 126: ...2 80 Service Guide 2 5 4 1 Functional Block Diagram Figure 2 10 M38813 Block Diagram ...
Page 128: ...2 82 Service Guide 2 6 2 Pin Diagram Figure 2 11 YMF715 Block Diagram ...
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