MC68MH360ZP25VL Freescale Semiconductor, MC68MH360ZP25VL Datasheet - Page 90

• Manufacturer Part Number: MC68MH360ZP25VL
• Description: IC MPU QUICC ETHER 25MHZ 357PBGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68MH360ZP25VL

• Processor Type: M683xx 32-Bit
• Speed: 25MHz
• Voltage: 3.3V
• Mounting Type: Surface Mount
• Package / Case: 357-PBGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

Freescale Semiconductor, Inc.
5.3.4 MC68MH360 Configured for QMC and Ethernet
Certain difficulties may arise when QMC and Ethernet are used together.
In a 25-MHz system, Ethernet can work together with 16 QMC channels. In this case, a
careful use of logical channels can free a 1-Kbyte space in the parameter area for up to 128
buffer descriptors. For more information, see Section 5.3.2, “Parameter RAM Usage for
QMC over Several SCCs.”
For 32-channel QMC operation coupled with Ethernet, a 33-MHz part is required. In
addition, Ethernet must operate on SCC1, and the QMC protocol must be divided over
SCC3 and SCC4 to use the combined FIFO size. This leaves SCC4’s parameter RAM page
unused as the largest single open space for the SCC1 Ethernet, resulting in 24 buffer
descriptors for transmission and reception in a single block. See Chapter 2, “QMC Memory
Organization,” for more information.
QMC Supplement
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