Major Chips Description 2-65
Table 2-13 PCI1131 Pin Descriptions (Continued)
TERMINAL
NAME NO.
I/O
TYPE
FUNCTION
PCI Interface Control Terminals
TRDY 196 I/O Target ready. Indicates the PCI 1131 ability to complete the current
data phase of the transaction. TRDY is used in conjunction with IRDY.
A data phase is completed on any clock where both TRDY I/O are
sampled asserted. During a read, TRDY indicates that valid data is
present on AD31-0. During a write, TRDY indicates the PCI1131 is
prepared to accept data. Wait cycles are inserted until both TIRDY and
TRDY are asserted together. This signal is an output when the PCI
1131 is the PCI target. and an input when it is the PCI bus master.
IRQ10/CLKRUN
159
IRQ12/CLKRUN
161
I/O Interrupt Request 10 and 12. This terminal is software configurable
and is used by the PCI 1131 to support the PCI Clock Run protocol.
When configured as CLKRUN, by setting bit 0 in the System Control
Register at offset 80h, this terminal is an open drain output. To select
between IRQ10 and IRQ12 as the output use bit 7 of Register 80h.
TERMINAL
Name Slot
Slot
I/O
TYPE
FUNCTION
A+ B≠≠
1 6-bit PC Card Address and Data (Slots A and B)
A25 121 55
A24 118 53
A23 116 51
A22 114 49
A21 111 47
A20 109 45
A19 107 42
A18 105 40
A17 103 37
A16 112 48
A15 115 50
A14 108 43
A12 106 41
A11 100 34
A10 95 29
A9 102 36
A8 104 39
A7 119 54
A6 123 57
A5 125 59
A4 126 60
A3 128 62
A2 131 65
A 1 132 66
A0 133 67
OPC Card Address. 16-bit PC Card address lines. A25 is the most
significant bit.
+ Terminal name is preceded with A_. As an example, the full name for terminal 121 is A_A25.
≠ Terminal name is preceded with B_. As an example, the full name for terminal 55 is B_A25.