參數(shù)資料
型號(hào): MCC3E0RX180WB0B
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 180 MHz, RISC PROCESSOR, CBGA728
封裝: 29 X 29 MM, 4 MM HEIGHT, 1 MM PITCH, CERAMIC, FCBGA-728
文件頁數(shù): 69/120頁
文件大?。?/td> 1633K
代理商: MCC3E0RX180WB0B
52
CHAPTER 2: SIGNAL DESCRIPTIONS
C3ENPA1-DS/D REV 03
MOTOROLA GENERAL BUSINESS INFORMATION
MRASX
A23
1
LVTTL
O
PD
Command Outputs: MRASX, MCASX, MWEX and
MCSX define the command being entered. MCSX
is considered part of the command code.
MWEX
A22
1
LVTTL
O
PD
Command Outputs: MRASX, MCASX, MWEX and
MCSX define the command being entered. MCSX
is considered part of the command code.
MCSX
A25
1
LVTTL
O
PD
Chip Select: MCSX enables (registered LOW) and
disables (registered HIGH) the command decoder.
All commands are masked when MCSX is
registered HIGH. MCSX provides the external bank
selection on systems with multiple banks. MCSX is
considered part of the command code.
MDQM
MDQML
A20
A21
1
LVTTL
O
PD
O
PD
Input/Output Mask: MDQM is an input mask
signal for write accesses and an output enable
signal for read accesses. Input data is masked
when MDQM is sampled HIGH during a WRITE
cycle. The output buffers are placed in a high Z
state (two-clock latency) when MDQM is sampled
HIGH during the READ cycle.
NOTE: MDQML is an identical copy of MDQM
used to drive the loading on SDRAM
configurations with 2 DQM pins.
MDCLK
A26
1
LVTTL
IPD
Clock: MDCLK is driven by the system clock. All
SDRAM input signals are sampled on the positive
edge of the MDCLK. MDCLK also increments the
internal burst counter and controls the output
registers.
TOTAL PINS
160
Table 22 BMU SDRAM Interface Signals (continued)
SIGNAL NAME
PIN #
TOTAL
TYPE
I/O
SIGNAL DESCRIPTION
F
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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