Motorola MPC823e User Manual

System Interface Unit
MOTOROLA MPC823e REFERENCE MANUAL 12-29
SYSTEM INTERFACE UNIT
12
12.11 MULTIPLEXING THE SYSTEM INTERFACE UNIT PINS
Due to the limited number of pins available in the MPC823e package, some of the
functionalities share pins. The actual MPC823e pinout is illustrated in
Section 2 External Signals. The following table shows how the functionality is controlled
on each pin.
Table 12-2. Multiplexing Control
PIN NAME PIN CONFIGURATION CONTROL
TSIZ0/REG
Dynamically active depending if the transaction addresses a slave controlled by
the PCMCIA interface.
BDIP
/GPL_B5
RSV/IRQ2
KR/RETRY/IRQ4/SPKROUT
DP[0:3]/IRQ
[3:6]
FRZ/IRQ6
Programmed in the SIUMCR.
CS6
/CE1_B
CS7/CE2_B
Address matching and bank valid bits.
When there is a transfer such that there is a match in either memory controller
bank 6 or any PCMCIA bank mapped to slot B, the CS6/CE1_B will be asserted.
When there is a transfer such that there is a match in either memory controller
bank 7 or any PCMCIA bank mapped to slot B, the CS7/CE2_B will be asserted.
WE0/BS_AB0/IORD
WE1/BS_AB1/IOWR
WE2/BS_AB2/PCOE
WE3/BS_AB3/PCWE
Dynamically active depending on the machine (GPCM, UPMB, or PCMCIA
interface) assigned to control the required slave.
GPL_A0
/GPL_B0 Dynamically active depending on the machine (UPMA or UPMB) assigned to
control the required slave.
OE
/GPL_A1/GPL_B1 Dynamically active depending on the machine (GPCM, UPMA, or UPMB)
assigned to control the required slave.
GPL_A
[2:3]/GPL_B[2:3]/
CS
[2:3]
GPL_A
[2:3]/GPL_B[2:3]: Dynamically active depending on the machine
(UPMA or UPMB) assigned to control the required slave.
GPL_A[2:3]/CS[2:3]: Programmed in the SIUMCR.
ALE_B/DSCK/AT1
IP_B[0:1]/IWP[0:1]/VFLS[0:1]
IP_B2/IOIS16_B
/AT2
IP_B3/IWP2/VF2
IP_B4/LWP0/VF0
IP_B5/LWP1/VF1
IP_B6/DSDI/AT0
IP_B7/PTR
/AT3
TDI/DSDI
TCK/DSCK
TDO/DSDO
Programmed in the SIUMCR and hard reset configuration.
UPWAITA/GPL_A4/AS Programmed in the SIUMCR and MAMR of the memory controller.
OP2/MODCK2/STS
OP3/MODCK2/DSDO
At power-on reset, this functions as MODCK[1:2]
Otherwise, programmed in the SIUMCR and hard reset configuration.

Motorola MPC823e Specifications

General

Brand	Motorola
Model	MPC823e
Category	Computer Hardware
Language	English