參數(shù)資料
型號: MCC501RX200TD0B
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: SPECIALTY MICROPROCESSOR CIRCUIT, PBGA838
封裝: BGA-838
文件頁數(shù): 33/102頁
文件大?。?/td> 1929K
代理商: MCC501RX200TD0B
January 21, 2002— Preliminary Version
C-Port Confidential
36
CHAPTER 2: SIGNAL DESCRIPTIONS
Figure 4 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 5.
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
16
PROM _H_Word
C-5 Network Processor
PROM Clock Gen.
31
21
6
1
0
PROM _Return_Data
PROM Sequencer
21
0
CE
SPCLK
SPLD
SPDO
SPDI
Internal Shift
Register
PROM_ADDR<21:1>
CE
PROM _LO_Word
21
6 0
21
0
21
1
PROM
PROM_Data
16
External Shift
Register
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