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Table 2-2
V1-LS Pin Descriptions (continued)
Pin Name
Pin No.
PCI Interface (continued)
IRDY#
157
PAR
173
PCICLK
172
PCIRST#
178
PERR#
170
PLOCK#
161
REQ[3:0]#
162:165
STOP#
160
TRDY#
158
Power Management Controller Interface
DOCKED
128
DOCK_START
129
EXTACT[1:0]
148, 149
GPIO0/LED0
131
GPIO1/LED1/
130
SUSPA#
130
GPIO2/
129
DOCK_START
Type
I/O
INITIATOR READY#: This indicates the bus master's state of
readiness to complete the current data phase. During a write,
IRDY# shows that valid data is present. During a read, it indicates
the bus master's readiness to accept data. IRDY# is used in
conjunction with TRDY#.
l/O
PARITY: AII PCI agents require parity generation.
l/O
PCI CLOCK: This pin provides timing for all transactions on the
PCI bus.
O
PCI RESET: This signal when asserted resets all PCI devices.
I
PARITYERROR#: This input indicates a data parity error. It may
be pulsed active by any agent that detects an error condition.
I/O
PLOCK#: This signal allows the master to lock the PCI bus and
the arbiter does not grant the PCI bus to a new master until this
signal has been deasserted.
I
PCI REQUEST[3:0]#: This signal indicates to the arbiter that this
agent requests use of the bus. This is a point-to-point signal. Every
PCI bus master has its own REQ#.
I/O
STOP#: This signal facilitates either master abort or target abort
cycles.
I/O
TARGET READY#: This indicates the ability of the target device to
complete the current data phase of the bus transaction. During a
read phase, TRDY# indicates that the valid data is present. During
a write phase, it indicates that the device is prepared to accept
data.
l/O
See GPIO3.
l/O
See GPIO2
I
EXTERNAL ACTIVITY[1:0]: These pins indicate that there is
current external activity.
l/O
GENERALPURPOSE I/O: This pin can also be selected as a
general purpose pin. Its function can be enabled by index register
352H, bit 0. LED0: LED indicator output 1.
I/O
GENERAL PURPOSE I/O 1#: This pin can also be selected as a
general purpose pin. Its function can be enabled by index register
352H, bits [2:1]. LED 1#: LED indicator output 1.
SUSPEND ACKNOWLEDGE#: This output from the Cyrix M1
CPU indicates a suspend acknowledge state.
I/O
GENERAL PURPOSE I/O 2: This pin can also be selected as a
general purpose pin. Its function can be enabled by index register
352H, bit 3. DOCKING START: This pin indicates that docking
has started.
Description
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