參數(shù)資料
型號(hào)： ST40RA166XH6
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 166 MHz, RISC PROCESSOR, PBGA372
封裝： 27 X 27 MM, 2.33 MM HEIGHT, PLASTIC, BGA-372
文件頁數(shù)： 27/92頁
文件大?。?/td> 2129K
代理商： ST40RA166XH6
5 System configuration
ST40RA
33/92
NOTMACK
(Master)
EMI_BUS_GRANT EMI_BUS_GRANT EMI_BUS_GRANT MPX bus
acknowledge
MPX bus
acknowledge
FCLKOUT
-
FLASHCLOCK
-
NOTFBAA
-
Unconnected/
connectedb
--
-
NOTESCS0
----
MBXINT
NOTESCS1
----
EMPIDREQ0
NOTESCS2
----
EMPIDRAK0
a. When the EMI is configured in master mode (MODE9 = H), and an external slave DMA asks for
access to the bus (using NOTMACK or NOTMREQ), RFSH_PENDING and ACC_PENDING are
used to signal that, while the external DMA request has been granted and the DMA is using the bus,
a refresh time out occurred, or that the EMI has been asked for a new access. A bus arbiter, if
present, can use this information to give back the bus to the EMI to allow a refresh operation, or
improve bandwidth. When the EMI is in slave mode (MODE9 = L), RFSH_PENDING is always
deasserted (so EPENDING = ACC_PENDING), and the pin is used to signal to the external bus
arbiter that the EMI needs to use the bus.
b. NOTFBAA is an output of the ST40RA, and an input to the memory device. The pin must be left
unconnected from the ST40RA side and tied low at the memory device side if the memory is an Intel
or an STM part. It needs to be connected if the SFlash is an AMD.
Table 11: EMI pin functions
ST40RA EMI pin
Peripheral
SFlash
SDRAM
MPX
MPX/EMPI
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