參數(shù)資料
型號: C3ENPA1-DS
英文描述: 5.0 or 3.3V, 256Kbit (32Kbit x 8) ZEROPOWER® SRAM
中文描述: ? - 3E的網(wǎng)絡(luò)處理器的數(shù)據(jù)資料硅修訂格A1
文件頁數(shù): 46/114頁
文件大?。?/td> 1893K
代理商: C3ENPA1-DS
46
CHAPTER 2: SIGNAL DESCRIPTIONS
C3ENPA1-DS/D REV 03
MOTOROLA GENERAL BUSINESS INFORMATION
Figure 5
PROM Interface Diagram
The PROM interface operates in the following manner (Note that two accesses are
piplined together to execute one 32-bit fetch). The steps are shown in
Figure 6
.
1
The PROM_ADDR is loaded into the network processor internal shift register.
2
The PROM_ADDR is shifted into the external shift register for 22 SPCLK cycles.
3
SPLD is asserted for one SPCLK cycle, loading the PROM_ADDR into the external
presentation register.
4
SPLD is deasserted for 22 SPCLK cycles. The PROM presents the first 16bit
PROM_DATA. At the same time, the next PROM_ADDR is shifted into the external shift
register.
5
SPLD is asserted for one SPCLK cycle, loading the PROM_ADDR into the external
presentation register and the first PROM_DATA into the external shift register.
6
SPLD is deasserted for 22 SPCLK cycles, shifting the first PROM_DATA into the network
processor internal shift register.
7
SPLD is asserted for one SPCLK cycle, loading the first PROM_DATA into the network
processor PROM_RETURN_DATA register and the second PROM_DATA into the
external shift register.
External Logic
PROM_ADDR<21:1>
15
15
PROM _LO_Word
16
PROM _H_Word
C-3e Network Processor
PROM Clock Gen.
31
21
21
6
1
0
PROM _Return_Data
PROM Sequencer
21
0
CE
SPCLK
SPLD
SPDO
SPDI
Internal Shift
Register
PROM_ADDR<21:1>
CE
21
6 0
21
0
21
1
PROM
PROM_Data
16
ExterRegister
F
n
.
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