MC68MH360EM25L Freescale Semiconductor, MC68MH360EM25L Datasheet - Page 804

• Manufacturer Part Number: MC68MH360EM25L
• Description: IC MPU QUICC ETHER 25MHZ 240FQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68MH360EM25L

• Processor Type: M683xx 32-Bit
• Speed: 25MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 240-FQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

Applications
9.8.2.4 EEPROM. Figure 9-31 shows the interface to an EEPROM device to give a small
amount of nonvolatile storage. In this case a byte-wide EEPROM bank is defined to mini-
mize cost. If the port size of the chip select is selected to be 8-bits, then each byte of the
EEPROM may be accessed in succession. The CS4 pin should be programmed to respond
to an 8K byte area in this design.
Only one byte should be written at a time. After a write is made, software is responsible for
waiting the appropriate time (e.g. 10 ms) or for doing data polling to see if the newly written
data byte is correct.
9.8.2.5 DRAM SIMM. Figure 9-32 shows the interface to an MCM32100S DRAM single in-
line memory module (SIMM). Both the MC68EC030 and the QUICC can access the DRAM.
When the QUICC is a slave to an external MC68EC030, the address multiplexing for the
DRAM must be done externally to the QUICC, which is accomplished in the three F157 mul-
tiplexers. The external address multiplexing scheme is very simple and allows page mode
operation to be provided for the MC68EC030, if desired. This multiplexing scheme exter-
nally provides, the same multiplexing method that the QUICC implements internally.
9-84
This multiplexing scheme allows the use of page mode, but re-
quires hardware modification if larger SIMMs are to be used on
the board. If the user is interested in the latter, rather than the
Figure 9-31. 8-Kbyte EEPROM Bank—8 Bits Wide
WE3
A12–A0
SYSTEM BUS AND
QUICC-GENERATED SIGNALS
R/W
D31–D24
CS4
Freescale Semiconductor, Inc.
For More Information On This Product,
MC68360 USER’S MANUAL
Go to: www.freescale.com
NOTE
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
CE (Enable)
OE
WE (Write)
EEPROM
PORT SIZE
8K 8
2864
BYTE
A10
A11
A12
A0
A2
A3
A4
A5
A6
A7
A8
A9
A1
MOTOROLA