MC68EN360AI25VL Freescale, MC68EN360AI25VL Datasheet - Page 133

• Manufacturer Part Number: MC68EN360AI25VL
• Manufacturer: Freescale

Specifications of MC68EN360AI25VL

• Family Name: M68000
• Device Core: ColdFire
• Device Core Size: 32b
• Frequency (max): 25MHz
• Instruction Set Architecture: RISC
• Operating Supply Voltage (max): 3.3V
• Operating Supply Voltage (min): 2.7V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 240
• Package Type: FQFP
• Lead Free Status / RoHS Status: Compliant

The state machine for the MC68040 companion mode arbitration is shown in Figure 4-39.
3. If the 68040 requests the bus at the same time that a QUICC internal master is re-
4. When the QUICC no longer needs the bus, it deasserts BB and asserts BG.
questing the bus, the BR040ID bits are used to determine who will acquire the bus first.
NOTES:
1. If the 68040 and the QUICC Internal Master requests the bus at the same time, the highest priority requester wins.
2. The transition from "040 Owns Bus" to "QUICC Waiting for Bus" may be delayed, until the write portion of an 040
3. BB is only asserted by QUICC during the state "QUICC Owns Bus", otherwise BB is three-stated by the QUICC.
Figure 4-39. MC68040 Companion Mode Bus Arbitration State Machine
locked cycle if an 040 locked cycle is in progress when the higher priority QUICC internal master requests the bus.
BR IS ASSERTED BY 040 AND 040 HAS
PRIORITY OVER CURRENT QUICC
QUICC NO LONGER NEEDS BUS
REFRESH DOES NOT NEED BUS
EXTERNAL
HALT ASSERTED AND DRAM
BUS IDLE
INTERNAL BUS MASTER
OR
ASSERTED
Freescale Semiconductor, Inc.
IDLE
BG
For More Information On This Product,
040 REQUESTS BUS
MC68360 USER’S MANUAL
INTERNAL MASTER (IDMA, SDMA, OR DRAM
Go to: www.freescale.com
HALT IS ASSERTED AND DRAM REFRESH
DOES NOT REQUIRE EXTERNAL BUS
040 FINISHES
USE OF BUS
REFRESH) REQUESTS BUS
BB ASSERTED
BG NEGATED
OWNS BUS
ASSERTED
040 OWNS
QUICC
BUS
BG
040 STILL NEEDS BUS
QUICC STILL NEEDS BUS
QUICC INTERNAL MASTER OF HIGHER
PRIORITY THAN THE 68040 REQUIRES
BB = 1
EXTERNAL BUS
WAITING FOR
NEGATED
QUICC
BUS
BG
BB = 0
Bus Operation