Mobile Intel
Celeron Processor (0.18μ) in BGA2 and Micro-PGA2 Packages
Datasheet
Order Number#249563-001
68
appropriate pins/balls on both agents on the system bus if they are used. During power-on
configuration, DEP[7:0]# signals can be enabled for ECC checking or disabled for no checking.
DRDY# (I/O - GTL+)
The DRDY# (Data Ready) signal is asserted by the data driver on each data transfer, indicating
valid data on the data bus. In a multi-cycle data transfer, DRDY# can be deasserted to insert idle
clocks. This signal must be connected to the appropriate pins/balls on both agents on the system
bus.
EDGCTRLP (Analog)
The EDGCTRLP (Edge Rate Control) signal is used to configure the edge rate of the GTL+ output
buffers. Connect the signal to V
SS
with a 110-
, 1% resistor.
FERR# (O - 1.5V Tolerant Open-drain)
The FERR# (Floating-point Error) signal is asserted when the processor detects an unmasked
floating-point error. FERR# is similar to the ERROR# signal on the Intel 387 coprocessor, and it
is included for compatibility with systems using DOS-type floating-point error reporting.
FLUSH# (I - 1.5V Tolerant)
When the FLUSH# (Flush) input signal is asserted, the processor writes back all internal cache
lines in the Modified state and invalidates all internal cache lines. At the completion of a flush
operation, the processor issues a Flush Acknowledge transaction. The processor stops caching any
new data while the FLUSH# signal remains asserted.
On the active-to-inactive transition of RESET#, each processor bus agent samples FLUSH# to
determine its power-on configuration.
HIT# (I/O - GTL+), HITM# (I/O - GTL+)
The HIT# (Snoop Hit) and HITM# (Hit Modified) signals convey transaction snoop operation
results, and must be connected to the appropriate pins/balls on both agents on the system bus.
Either bus agent can assert both HIT# and HITM# together to indicate that it requires a snoop
stall, which can be continued by reasserting HIT# and HITM# together.
IERR# (O - 1.5V Tolerant Open-drain)
The IERR# (Internal Error) signal is asserted by the processor as the result of an internal error.
Assertion of IERR# is usually accompanied by a SHUTDOWN transaction on the system bus.
This transaction may optionally be converted to an external error signal (e.g., NMI) by system
logic. The processor will keep IERR# asserted until it is handled in software or with the assertion
of RESET#, BINIT, or INIT#.