IPBus Programming Model
MSC8113 Reference Manual, Rev. 0
Freescale Semiconductor
19-5
Stop for TDMs. When you disable the specific TDM (both the receiver and transmitter of
the TDM are disabled), and there is no access to the TDM via the IP master, the TDM
automatically shuts down its clock. The clock is turned on when the TDM is enabled or
accessed (see Chapter 20, TDM Interface).
Stop for Timers. When a specific timer is not enabled (disable the timers by clearing the
TE bit in all 16 TCRs) and there is no access to it via the IP master, the timer automatically
shuts down its clock. The clocks are turned on when the timer is enabled or accessed (see
Chapter 22, Timers).
Stop for UART. The UART uses the stop bit for the clock stop. Its stop acknowledge is
unconditioned, but entering the Stop mode during a transmission or reception results in
invalid data (see Chapter 21, UART).
Stop for DSI. The DSI uses the stop bit to complete the clock stop. Its stop acknowledge is
conditioned by the setting of the DDR[DSISTP] bit and an empty write buffer (no pending
accesses). Upon receiving a request from a stop request bit, it continues to perform all the
accesses waiting in the write buffer and does not perform prefetches into the read buffer
(see
Chapter 14, Direct Slave Interface (DSI)).
Stop for Ethernet Controller. The Ethernet Controller uses the stop bit for the clock stop.
Its stop acknowledge is conditioned by setting the SCR1[ETH_STC] bit and disabling the
Interrupt Events (see Chapter 25, Ethernet Controller).
Stop for GIC. The GIC uses the stop bit to stop its clocks in a sequence. It keeps pending
interrupts and enables handling them, but it does not detect new interrupts. It
acknowledges a stop request only when there are no more enabled pending interrupts (see
Chapter 17, Interrupt Processing).
19.11 IPBus Programming Model
Refer to Section 8.5, IPBus Address Space, on page 8-12 for the IPBus base address.
Figure 19-2. Stop Mode for Different IPBus Modules
TDM0
TDM1
TDM2
IP Master
UART
TDM3
Timer A
Timer B
GIC
DSI
Stop Acknowledge Status Register
UART
STA
DSI
STA
GIC
STA
TDM2
STA
TDM0
STA
TimerA
STA
TimerB
STA
TDM1
STA
TDM3
STA
UART
GIC_ DSI_
STC STC _STC
Stop Control Register
Ethernet
ETH
STA
ETH
STC
Содержание MSC8113
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