Serial Management Controllers (SMCs)
7-306
MC68360 USER’S MANUAL
NOTE
The SMCs on the QUICC differ from the SMCs on the MC68302.
On the QUICC, a single SMC handles both the monitor and C/I
fields of a GCI channel. On the MC68302, one SMC handles the
monitor field, and another SMC is required for the C/I field. Ad-
ditionally, the MC68302 cannot use SCIT channel 1; whereas,
the QUICC can.
To use the SMC GCI channels properly, the TSA in the SI must be configured to route the
monitor and C/I channels to the desired SMC. See 7.8 Serial Interface with Time Slot
Assigner for more details on how to program this configuration. The following SMC discus-
sion assumes that this time-slot routing is programmed properly.
7.11.14.1 SMC GCI MEMORY MAP. The GCI parameter RAM area begins at the same off-
set from each SMC base area.
The SMC GCI mode has a very different set of parameter RAM than the SMC UART or SMC
transparent modes. In the SMC GCI mode, the general-purpose parameter RAM contains
the BDs, rather than pointers to the BDs. Contrast Table 7-15 with Table 7-12 to see these
differences. Additionally, the SMC in GCI mode contains no protocol-specific parameter
RAM.
NOTES:
RSTATE, M_RxD, M_TxD, CI_RxD, and CI_TxD do not need to be accessed by the user in normal
operation, and are reserved areas for RISC use only.
7.11.14.1.1 SMC Monitor Channel Transmission. The monitor channel 0 is used for data
exchange with a layer 1 device (e.g., reading and writing internal registers and transferring
of the S and Q bits). The monitor channel 1 is used for programming and controlling voice/
data modules such as CODECs.
Table 7-15. SMC GCI Parameter RAM
Address
Name
Width
Description
SMC Base + 00
M_RxBD
Word
Monitor Channel Rx BD
SMC Base + 02
M_TxBD
Word
Monitor Channel Tx BD
SMC Base + 04
CI_RxBD
Word
C/I Channel Rx BD
SMC Base + 06
CI_TxBD
Word
C/I Channel Tx BD
SMC Base + 08
RSTATE
Long
Rx & Tx Internal State
SMC Base + 0C
M_RxD
Word
Monitor Rx Data
SMC Base + 0E
M_TxD
Word
Monitor Tx Data
SMC Base + 10
CI_RxD
Word
C/I Rx Data
SMC Base + 12
CI_TxD
Word
C/I Tx Data
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Freescale Semiconductor, Inc.
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