MC68MH360EM33L Freescale Semiconductor, MC68MH360EM33L Datasheet - Page 400

• Manufacturer Part Number: MC68MH360EM33L
• Description: IC MPU QUICC ETHER 33MHZ 240FQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68MH360EM33L

• Processor Type: M683xx 32-Bit
• Speed: 33MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 240-FQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

Serial Interface with Time Slot Assigner
Dynamic changes mean that the routing definition of a TDM can be modified while the
SCCs/SMCs are connected to the TDM. With fixed routing, a change to the routing requires
that all SCCs/SMCs connected to the TSA be disabled, the SI routing be modified, and then
all SCCs/SMCs connected to the TSA be reenabled before the new routing takes effect.
Dynamic changes divide portions of the SI RAM into current-route RAM and shadow RAM.
Once the current-route RAM is programmed, the TSA and SI channels can be enabled, and
TSA operation can begin. When the user decides that a change in routing is required, the
user programs the shadow RAM with the new route and sets the CSRx bit in the SI CR. As
a result, the SI will exchange the shadow RAM and the current-route RAM as soon as the
corresponding sync arrives and will reset the CSRx bit to signify that the operation is com-
plete. At this time, the user may change the routing again. Note that the original current-
route RAM is now the shadow RAM and vice versa. Figure 7-28 illustrates an example of
the shadow RAM exchange process.
If one TDM with dynamic changes is programmed, the initial current-route RAM addresses
in the SI RAM are as follows:
and the shadow RAMs are at addresses:
If two TDMs with dynamic changes are programmed, the initial current-route RAM address-
es in the SI RAM are as follows:
and the shadow RAMs are at addresses:
The user can read any RAM at any time, but for proper operation of the SI, the user must
not attempt to write the current-route RAM. The user can read the SI status register (SISTR)
to find which part of the RAM is the current-route RAM.
Beyond knowing which RAM is the current-route RAM, the user may wish to know which
entry that the TSA is currently using within the current-route RAM. This information is pro-
vided in the SI RAM pointer register (SIRP). The user may also externally connect one of
the four strobes to an interrupt pin to generate an interrupt on a particular SI RAM entry start-
ing or ending execution by the TSA.
7-76
• 0–63 RXa Route
• 128–191TXa Route
• 64–127 RXa Route
• 192–255TXa Route
• 0–31 RXa Route
• 64–93 RXb Route
• 128–159TXa Route
• 192–223TXb Route
• 32–63 RXa Route
• 96–93 RXb Route
• 160–191TXa Route
• 224–255TXb Route
Freescale Semiconductor, Inc.
For More Information On This Product,
MC68360 USER’S MANUAL
Go to: www.freescale.com
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