CS5535-UDCF AMD (ADVANCED MICRO DEVICES), CS5535-UDCF Datasheet - Page 39
CS5535-UDCF
Manufacturer Part Number
CS5535-UDCF
Description
Manufacturer
AMD (ADVANCED MICRO DEVICES)
Datasheet
1.CS5535-UDCF.pdf
(579 pages)
Specifications of CS5535-UDCF
Operating Temperature (min)
0C
Operating Temperature (max)
85C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Lead Free Status / RoHS Status
Compliant
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CS5535-UDCF
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Signal Definitions
3.2.2
Note 1. Use RESET_OUT# for PCI reset.
AMD Geode™ CS5535 Companion Device Data Book
Signal Name
(Note 1)
IRDY#
TRDY#
STOP#
REQ#
GNT#
For SMI, PME, INTA#, and INTB# functions, see Table 3-8 "GPIO Options" on page 47.
PCI Interface Signals (Continued)
Ball No.
R10
T10
T11
T1
R1
Type
I/O
I/O
I/O
O
I
Description
PCI Initiator Ready. IRDY# is driven by the master to indicate valid
data on a write transaction, or that it is ready to receive data on a read
transaction.
When the Geode CS5535 companion device is a PCI slave, IRDY# is
an input that can delay the beginning of a write transaction or the com-
pletion of a read transaction.
Wait cycles are inserted until both IRDY# and TRDY# are asserted
together.
Normally connected to a 10k to15k Ω external pull-up. This signal is in
TRI-STATE mode after reset.
PCI Target Ready. TRDY# is asserted by a PCI slave to indicate it is
ready to complete the current data transfer.
TRDY# is an input that indicates a PCI slave has driven valid data on a
read or a PCI slave is ready to accept data from the Geode CS5535
companion device on a write.
TRDY# is an output that indicates the Geode CS5535 companion
device has placed valid data on AD[31:0] during a read or is ready to
accept the data from a PCI master on a write.
Wait cycles are inserted until both IRDY# and TRDY# are asserted
together.
Normally connected to a 10k to15k Ω external pull-up. This signal is in
TRI-STATE mode after reset.
PCI Stop. As an input, STOP# indicates that a PCI slave wants to ter-
minate the current transfer. The transfer is either aborted or retried.
STOP# is also used to end a burst.
As an output, STOP# is asserted with TRDY# to indicate a target dis-
connect, or without TRDY# to indicate a target retry. The Geode
CS5535 companion device asserts STOP# during any cache line
crossings if in single transfer DMA mode or if busy.
Normally connected to a 10k to15k Ω external pull-up. This signal is in
TRI-STATE mode after reset.
PCI Bus Request. The Geode CS5535 companion device asserts
REQ# to gain ownership of the PCI bus. The REQ# and GNT# signals
are used to arbitrate for the PCI bus.
REQ# should connect to the REQ2# of the Geode GX processor and
function as the highest-priority PCI master.
PCI Bus Grant. GNT# is asserted by an arbiter that indicates to the
Geode CS5535 companion device that access to the PCI bus has
been granted.
GNT# should connect to GNT2# of the Geode GX processor and func-
tion as the highest-priority PCI master.
31506B
39
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