60x-Compatible Bus Protocols
MSC8113 Reference Manual, Rev. 0
Freescale Semiconductor
13-37
cannot be enabled when the MSC8113 is in 60x-compatible bus mode and a device that uses
DBB
is connected to the bus. This restriction is necessary because MSC8113 in data streaming mode
may leave
DBB
asserted after the last
TA
of a transaction, thus violating the strict bus protocol.
Data streaming mode is enabled by setting BCR[ETM].
13.2.4.3 Data Bus Transfers and Normal Termination
The data transfer signals include
D[0–63]
and
DP[0–7]
. For memory accesses, the data signals form
a 64-bit data path,
D[0–63]
, for read and write operations. The MSC8113 handles data transfers in
either single-beat or burst operations. Single-beat operations transfer from 1 to 24 bytes of data at
a time. Burst operations always transfer 256 bits in four 64-bit beats. A burst transaction is
indicated when the bus master asserts
TBST
. A transaction terminates normally when
TA
is
asserted.
The
TA, TEA,
and
ARTRY
signals
terminate the individual data beats of the data tenure and the data
tenure itself:
TA
indicates normal termination of data transactions. It must always be asserted on the bus
cycle coincident with the data that it is qualifying. The slave can withhold it for any
number of clocks until valid data is ready to be supplied or accepted.
Asserting
TEA
indicates a nonrecoverable bus error event. Upon receiving a final (or only)
termination condition, the MSC8113 always deasserts
DBB
for one cycle, except when fast
data bus grant is performed.
Asserting
ARTRY
causes the data tenure to terminate immediately if the
ARTRY
is for the
address tenure associated with the data tenure in operation (the data tenure may not be
terminated due to address pipelining). The earliest allowable assertion of
TA
depends
directly on the latest possible assertion of
ARTRY
.
Figure 13-9 shows both a single-beat and burst data transfer. The MSC8113 asserts
TA
to mark
the cycle in which data is accepted. In a normal burst transfer, the fourth assertion of
TA
signals
the end of a transfer.
Содержание MSC8113
Страница 1: ...MSC8113 Reference Manual Tri Core 16 Bit Digital Signal Processor MSC8113RM Rev 0 May 2008 ...
Страница 20: ...MSC8113 Reference Manual Rev 0 xx Freescale Semiconductor Contents ...
Страница 28: ...MSC8113 Reference Manual Rev 0 xxviii Freescale Semiconductor ...
Страница 56: ...MSC8113 Reference Manual Rev 0 1 28 Freescale Semiconductor MSC8113 Overview ...
Страница 76: ...MSC8113 Reference Manual Rev 0 2 20 Freescale Semiconductor SC140 Core Overview ...
Страница 134: ...MSC8113 Reference Manual Rev 0 4 30 Freescale Semiconductor System Interface Unit SIU ...
Страница 168: ...MSC8113 Reference Manual Rev 0 6 18 Freescale Semiconductor Boot Program ...
Страница 180: ...MSC8113 Reference Manual Rev 0 7 12 Freescale Semiconductor Clocks ...
Страница 260: ...MSC8113 Reference Manual Rev 0 8 80 Freescale Semiconductor Memory Map ...
Страница 300: ...MSC8113 Reference Manual Rev 0 9 40 Freescale Semiconductor Extended Core ...
Страница 304: ...MSC8113 Reference Manual Rev 0 10 4 Freescale Semiconductor MQBus and M2 Memory ...
Страница 308: ...MSC8113 Reference Manual Rev 0 11 4 Freescale Semiconductor SQBus ...
Страница 544: ...MSC8113 Reference Manual Rev 0 16 46 Freescale Semiconductor Direct Memory Access DMA Controller ...
Страница 590: ...MSC8113 Reference Manual Rev 0 17 46 Freescale Semiconductor Interrupt Processing ...
Страница 614: ...MSC8113 Reference Manual Rev 0 18 24 Freescale Semiconductor Debugging ...
Страница 622: ...MSC8113 Reference Manual Rev 0 19 8 Freescale Semiconductor Internal Peripheral Bus IPBus ...
Страница 724: ...MSC8113 Reference Manual Rev 0 21 32 Freescale Semiconductor UART ...
Страница 920: ...MSC8113 Reference Manual Rev 0 25 150 Freescale Semiconductor Ethernet Controller ...
Страница 1171: ...MSC8113 Reference Manual Rev 0 Freescale Semiconductor C 61 EF wait_rts P 01077FFC 9F rts 71 ...
Страница 1172: ...MSC8113 Reference Manual Rev 0 C 62 Freescale Semiconductor MSC8113 Boot Code ...
Страница 1202: ...MSC8113 Reference Manual Rev 0 Index 30 Freescale Semiconductor Index ...