參數(shù)資料
型號： MSC8122TMP6400
廠商： 飛思卡爾半導(dǎo)體(中國)有限公司
元件分類： 數(shù)字信號處理
英文描述： Quad Core 16-Bit Digital Signal Processor
中文描述： 四核16位數(shù)字信號處理器
文件頁數(shù)： 85/88頁
文件大?。?/td> 983K
代理商： MSC8122TMP6400
Connectivity Guidelines
MSC8122 Technical Data, Rev. 13
Freescale Semiconductor
4-3
4.3 Connectivity Guidelines
Unused output pins can be disconnected, and unused input pins should be connected to the non-active value, via
resistors to
V
DDH
or
GND
, except for the following:
If the DSI is unused (DDR[DSIDIS] is set),
HCS
and
HBCS
must pulled up and all the rest of the DSI signals
can be disconnected.
When the DSI uses synchronous mode,
HTA
must be pulled up. In asynchronous mode,
HTA
should be pulled
either up or down, depending on design requirements.
HDST
can be disconnected if the DSI is in big-endian mode, or if the DSI is in little-endian mode and the
DCR[DSRFA] bit is set.
When the DSI is in 64-bit data bus mode and DCR[BEM] is cleared, pull up
HWBS[1–3]
/
HDBS[1–3]
/
HWBE[1–3]
/
HDBE[1–3]
and
HWBS[4–7]
/
HDBS[4–7]
/
HWBE[4–7]
/
HDBE[4–7]
/
PWE[4–7]
/
PSDDQM[4–7]
/
PBS[4–7]
.
When the DSI is in 32-bit data bus mode and DCR[BEM] is cleared,
HWBS[1–3]
/
HDBS[1–3]
/
HWBE[1–3]
/
HDBE[1–3]
must be pulled up.
When the DSI is in asynchronous mode,
HBRST
and
HCLKIN
should either be disconnected or pulled up.
The following signals must be pulled up:
HRESET
,
SRESET
,
ARTRY
,
TA
,
TEA
,
PSDVAL
, and
AACK
.
In single-master mode (BCR[EBM] = 0) with internal arbitration (PPC_ACR[EARB] = 0):
—
BG
,
DBG
, and
TS
can be left unconnected.
—
EXT_BG[2–3]
,
EXT_DBG[2–3]
, and
GBL
can be left unconnected if they are multiplexed to the system bus
functionality. For any other functionality, connect the signal lines based on the multiplexed functionality.
—
BR
must be pulled up.
—
EXT_BR[2–3]
must be pulled up if multiplexed to the system bus functionality.
If there is an external bus master (BCR[EBM] = 1):
—
BR
,
BG
,
DBG
, and
TS
must be pulled up.
—
EXT_BR[2–3]
,
EXT_BG[2–3]
, and
EXT_DBG[2–3]
must be pulled up if multiplexed to the system bus
functionality.
In single-master mode,
ABB
and
DBB
can be selected as
IRQ
inputs and be connected to the non-active value. In
other modes, they must be pulled up.
Note:
The MSC8122 does not support DLL-enabled mode. For the following two clock schemes, ensure that the
DLL is disabled (that is, the DLLDIS bit in the Hard Reset Configuration Word is set).
If no system synchronization is required (for example, the design does not use SDRAM), you can use any of
the available clock modes.
In the
CLKIN
synchronization mode, use the following connections:
— Connect the oscillator output through a buffer to
CLKIN
.
— Connect
the CLKIN
buffer output to the slave device (for example, SDRAM) making sure that the delay
path between the clock buffer to the MSC8122 and the SDRAM is equal (that is, has a skew less than 100
ps).
— Valid clock modes in this scheme are: 0, 7, 15, 19, 21, 23, 28, 29, 30, and 31.
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