NEC V850E/MA1 User Manual page 153

Figure 5-4. On-Page/Off-Page Judgment During Page ROM Connection (2/2)
(b) In case of 16 Mb (1 M × × × × 16 bits) page ROM (8-word page access)
Internal address latch
(immediately preceding
a25
address)
V850E/MA1
A25
address output
(c) In case of 32 Mb (2 M × × × × 16 bits) page ROM (16-word page access)
Internal address latch
(immediately preceding
a25
address)
V850E/MA1
A25
address output
CHAPTER 5 MEMORY ACCESS CONTROL FUNCTION
a24 a23 a22 a21 a20
Comparison
A24 A23 A22 A21 A20
Page ROM address A19
a24 a23 a22 a21 a20
Comparison
A24 A23 A22 A21 A20
Page ROM address A19
User's Manual U14359EJ4V0UM
a7 a6 a5
MA6 MA5 MA4
0 0
A7 A6 A5
A6 A5 A4
Off-page address
a7 a6 a5
MA6 MA5 MA4
0 0
A7 A6 A5
A6 A5 A4
Off-page address
Continuous reading possible:
16-bit data bus width × 16 words
a4 a3
MA3
PRC register setting
0 1
A4 A3 A2 A1 A0
A1 A0
A3 A2
On-page address
Continuous reading possible:
16-bit data bus width × 8 words
a4 a3
MA3
PRC register setting
1 1
A4 A3 A2 A1 A0
A1 A0
A3 A2
On-page address
153