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C5C5EDELTA-RM/D 数据表(PDF) 53 Page - NXP Semiconductors |
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C5C5EDELTA-RM/D 数据表(HTML) 53 Page - NXP Semiconductors |
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53 / 114 page  Pin Descriptions Grouped by Function 53 03 MRASX C19 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 B19 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 A19 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 G18 F18 1 1 LVTTL 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 B18 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 25 BMU SDRAM Interface Signals (continued) SIGNAL NAME PIN # TOTAL TYPE I/O SIGNAL DESCRIPTION Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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