Motorola MPC823e User Manual

System Interface Unit
MOTOROLA MPC823e REFERENCE MANUAL 12-33
SYSTEM INTERFACE UNIT
12
MPRE—Multiprocessors Reservation Enable
If this bit is set, then the interprocessor reservation protocol is enabled. The RSV
pin
functions as defined in Section 13.4.10 Storage Reservation Protocol.
0 = RSV
/IRQ2 functions as IRQ2.
1= RSV
/IRQ2 functions as RSV.
MLRC—Multi-Level Reservation Control
This field configures the functionality of the KR
/RETRY/IRQ4/SPKROUT pins.
00 = KR
/RETRY/IRQ4/SPKROUT functions as IRQ4.
01 = KR
/RETRY/IRQ4/SPKROUT is three-stated.
10 = KR
/RETRY/IRQ4/SPKROUT functions as KR/RETRY.
11 = KR
/RETRY/IRQ4/SPKROUT functions as SPKROUT.
AEME—Asynchronous External Master Enable
This bit configures how the memory controller refers to external asynchronous masters
initiating a transaction. If this bit is set, the memory controller interprets any assertion on the
AS
pin as an external asynchronous master initiating a transaction. If it is reset, the memory
controller ignores the value of the AS
pin. This bit and the GPLA4DIS bit of the machine A
mode register (described in Section 15.3.1.5 Machine A Mode Register) controls the
direction and functionality of the UPWAITA/GPL_A4/AS
pins.
SEME—Synchronous External Master Enable
This bit configures how the memory controller refers to external synchronous masters
initiating a transaction. If this bit is set, the memory controller interprets any assertion on the
TS
pin the external bus does not own as an external synchronous master initiating a
transaction. If it is reset, the memory controller ignores the value of the TS
pin when it does
not own the external bus. When the MPC823e owns the bus, the memory interprets the
assertion of the TS
pin as an internal request.
GB5E—GPL_B5 Enable
0 = The BDIP
functionality is active.
1 = The GPL_B
5 of the memory controller functionality is active.
B2DD—Bank 2 Double Drive
If this bit is set, the CS2
signal is reflected on GPL_x2.
AEME GPLA4DIS PIN USAGE UPWAIT
VALUE
AS VALUE
X 0 Functions as GPL_A4
GND VCC
0 1 Functions as UPWAIT Pin value VCC
1 1 Functions as AS GND Pin value

Motorola MPC823e Specifications

General

Brand	Motorola
Model	MPC823e
Category	Computer Hardware
Language	English