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VR4102 Datasheet(PDF) 253 Page - NEC |
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VR4102 Datasheet(HTML) 253 Page - NEC |
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253 / 701 page  CHAPTER 10 BCU (BUS CONTROL UNIT) 253 Figure 10-1. ROM 4-byte Read, 16-bit Mode (WROMA[2:0] = 110) Trom Trom RD# ROMCS[3:0]# ADD[25:0] TClock(internal) DATA[15:0] Remark The dotted lines indicate high impedance. Figure 10-2. ROM 4-byte Read, 32-bit Mode (WROMA[2:0] = 110) Trom RD# ROMCS[3:0]# ADD[25:0] TClock(Internal) DATA[31:0] Remark The dotted lines indicate high impedance. Data is sampled at the rising edge of the TClock following the last Trom-state TClock. The bus operation types for ordinary ROM are as follows. 1-byte read, 2-byte read, 3-byte read, 1-word read, 2-word read, and 4-word read (1 word = 4 bytes) |
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