LG GCE-8240B Service Manual page 36

SYSTEM CONTROLLER INTERFACE
Pin Name Pin #
UA15 116
UA14 117
UA13 118
UA12 119
UA11 120
UA10 121
UA9 122
UA8 123
UA7 124
UA6 125
UA5 126
UA4 127
UA3 128
UA2 129
UA1 130
UA0 131
UAD7 104
UAD6 103
UAD5 102
UAD4 101
UAD3 100
UAD2 99
UAD1 98
UAD0 97
URD# /
105
UR/W#
UWR# /
106
UDS#
42
Type
System Controller Address 15 8 Bus: This bus is the upper 8-bits of the 16-
I bit system controller address. In register access mode (UCS0# asserted),
UA15 are not decoded.
System Controller Address 7 0 Bus: This bus is the lower 8-bits of the 16-
I bit system controller address when non-multiplexed mode is enabled (see
UALE description). In Non-Multiplexed Mode, U
System Controller Address 7 0/Data Bus: This bi-directional bus transfers
8-bit data. When multiplexed mode is enabled (see UALE description),
I/O UAD7 0 also functions as the lower 8-bits of the system controller address
bus. UAD7 0 is high-impedance when not used to transfer data or
addresses.
Microcontroller Read Strobe: In X86 Mode, URD# is the read data strobe.
I
Read or Write Status: In Motorola Mode, UR/W# high indicates that a read
S
is occurring when UDS# is asserted. UR/W# low indicates that a write is
occurring when UDS# is asserted.
Microcontroller Write Strobe: In X86 Mode, UWR# is the write data
strobe.
I
S
Data Strobe: In Motorola Mode, UDS# is the data strobe. Signal UR/W#
determines whether a read or write is occurring when UDS# is asserted.
Description
ust be grounded.