SC1200UFH-266 AMD (ADVANCED MICRO DEVICES), SC1200UFH-266 Datasheet - Page 57

• Manufacturer Part Number: SC1200UFH-266
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of SC1200UFH-266

• Operating Temperature (min): 0C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Not Compliant

Signal Definitions
3.4.7
AMD Geode™ SC1200/SC1201 Processor Data Book
Signal Name
STOP#
LOCK#
DEVSEL#
PCI Bus Interface Signals (Continued)
BalL No.
G1
H3
E4
Type
I/O
I/O
I/O
Description
Target Stop. STOP# is asserted to indicate that the cur-
rent target is requesting that the master stop the current
transaction. This signal is used with DEVSEL# to indicate
retry, disconnect, or target abort. If STOP# is sampled
active by the master, FRAME# is de-asserted and the
cycle is stopped within three PCI clock cycles. As an
input, STOP# can be asserted in the following cases:
1)
2)
3)
This signal is internally connected to a pull-up resistor.
Lock Operation. LOCK# indicates an atomic operation
that may require multiple transactions to complete. When
LOCK# is asserted, non-exclusive transactions may pro-
ceed to an address that is not currently locked (at least
16 bytes must be locked). A grant to start a transaction
on PCI does not guarantee control of LOCK#. Control of
LOCK# is obtained under its own protocol in conjunction
with GNT#.
It is possible for different agents to use PCI while a single
master retains ownership of LOCK#. The arbiter can
implement a complete system lock. In this mode, if
LOCK# is active, no other master can gain access to the
system until the LOCK# is de-asserted.
This signal is internally connected to a pull-up resistor.
Device Select. DEVSEL# indicates that the driving
device has decoded its address as the target of the cur-
rent access. As an input, DEVSEL# indicates whether
any device on the bus has been selected. DEVSEL# is
also driven by any agent that has the ability to accept
cycles on a subtractive decode basis. As a master, if no
DEVSEL# is detected within and up to the subtractive
decode clock, a master abort cycle is initiated (except for
special cycles which do not expect a DEVSEL#
returned).
This signal is internally connected to a pull-up resistor.
If a PCI master tries to access memory that has
been locked by another master. This condition is
detected if FRAME# and LOCK# are asserted dur-
ing an address phase.
If the PCI write buffers are full or if a previously buff-
ered cycle has not completed.
On read cycles that cross cache line boundaries.
This is conditional based upon the programming of
GX1 module’s PCI Configuration Register, Index
41h[1].
32579B
BHE#
Mux
D15
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