MC68MH360EM25L Freescale Semiconductor, MC68MH360EM25L Datasheet - Page 311

• 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: -

EMWS—External Master Wait State (SRAM Bank Only)
The following bits are used for both DRAM and SRAM memory:
SYNC—Synchronous External Access MC68030-Type
MOTOROLA
This attribute should be set if an additional wait state is necessary when an asynchronous
external MC68030-type device or external QUICC is accessing SRAM banks (see Table
6-11). This bit is only used if SYNC = 0.
This attribute applies only to an external MC68030-type device or external QUICC that
uses the on-chip memory controller. It determines how the memory controller will assert
its signals in response to what it sees from the external master.
When the SRAM controller is used, CS and DSACK assertion and negation timings are
asynchronous. They are asserted and negated in relation to the external master’s AS line.
The CSNTQ and the TRLXQ attributes are ignored. When EMWS is set, one wait state is
added to the programmed TCYC.
When the DRAM controller is used, CAS and DSACK are negated asynchronously with
the negation of the external master’s AS.
0 = Normal operation.
1 = Insert one additional wait state for external QUICC/MC68030-type masters on their
0 = Asynchronous operation of the memory controller (external MC68030-type master
accesses to all SRAM banks.)
only).
chronous to the QUICC clock. When asynchronous external
masters are using the DRAM controller, the BSTM bit in the
MCR should be cleared.
The DRAM controller’s assertion of RAS and CAS is always syn-
0
1
2
3
4
5
6
15
NOTE: The BSTM bit is located in the MCR of the SI60.
TCYC =
Table 6-11. External MC68030-Type Cycle Length
…
(SRAM Bank in Asynchronous Operation
Freescale Semiconductor, Inc.
For More Information On This Product,
Synchronous Bus Timing
EMWS = 0
External QUICC/MC68030-Type Bus Cycle Length
17
…
3
3
4
5
6
7
8
MC68360 USER’S MANUAL
(BSTM = 1)
Go to: www.freescale.com
EMWS = 1
NOTE
18
…
3
4
5
6
7
8
9
Asynchronous Bus Timing
EMWS = 0
18
…
3
3
5
6
7
8
9
(BSTM = 0)
System Integration Module (SIM60)
EMWS = 1
10
19
…
3
5
6
7
8
9
6-67