VR4102 datasheet(254/701 Pages) NEC

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VR4102 Datasheet(PDF) 254 Page - NEC

254 / 701 page

CHAPTER 10 BCU (BUS CONTROL UNIT)

254

(2) PageROM Read Mode

Set ROMWEN = 0 and PAGEROM = 1.

WROMA[2:0] (BCUSPEEDREG [2:0]) and WPROM[1:0] (BCUSPEEDREG [13:12]) can be used to set the

access time.

Figures 10-3 and 10-4 show 16-byte read timing charts for when WROMA [2:0] is set to “111” and WPROM [1:0]

is set to “10”. The ROMCS[3:0]# and RD# pins are held at low level during Trom cycles.

Table 10-9. PageROM Read Mode Access Time

WROMA [2:0]

Trom (TClock)

WPROM [1:0]

Tprom (TClock)

000

001

010

011

RFU

100

101

110

111

Figure 10-3. PageROM 4-word Read, 16-bit Mode (WROMA[2:0] = 111, WPROM[1:0] = 10)

Trom

RD#

ROMCS[3:0]#

ADD[25:0]

TClock(Internal)

DATA[15:0]

Tprom Tprom Tprom Tprom Tprom Tprom Tprom

Remark

The dotted lines indicate high impedance.

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