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Serial Interface with Time Slot Assigner
MC68360 USER’S MANUAL
The QUICC can identify and support each IDL channel or can output strobe lines for inter-
facing devices that do not support the IDL bus.
The IDL signals for each transmit and receive channel are as follows:
1. L1RCLKx—IDL clock; input to the QUICC.
2. L1RSYNCx—IDL sync signal; input to the QUICC. This signal indicates that the clock
periods following the pulse designate the IDL frame.
3. L1RXDx—IDL receive data; input to the QUICC. Valid only for the bits that are
supported by the IDL; ignored for other signals that may be present.
4. L1TXDx—IDL transmit data; output from the QUICC. Valid only for the bits that are
supported by the IDL; three-stated otherwise.
5. L1RQx—IDL request permission to transmit on the D channel; output from the QUICC
on L1RQx pin.
6. L1GRx—IDL grant permission to transmit on the D Channel; input to the QUICC on
L1TSYNCx pin.
NOTE
x = a and b for TDMa and TDMb.
The basic rate IDL bus has three channels:
B1—64 kbps bearer channel
B2—64 kbps bearer channel
D—16 kbps signaling channel
There are two definitions of the IDL bus frame structure: 8 bits and 10 bits (see Figure 7-33).
The difference between them is only the channel order within the frame.
NOTE
Previous versions of Motorola’s IDL-defined bit functions, called
auxiliary (A) and maintenance (M), were eliminated from the IDL
definition when it was decided that the IDL control channel would
be out-of-band. They were defined as a subset of the Motorola
SPI format called serial control port (SCP). If a user wishes to
implement the A and M bit functions as originally defined, the
TSA may be programmed to access these bits and to route them
transparently to an SCC or SMC. To perform the out-of-band
signaling required, the QUICC’s SPI may be used.
The QUICC supports all channels of the IDL bus in the basic rate. Each bit in the IDL frame
can be routed to every SCC and SMC or can assert a strobe output for supporting an exter-
nal device.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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