XA-H4 Datasheet, PDF (33/42 Pages) NXP Semiconductors – Single-chip 16-bit microcontroller

Philips Semiconductors
Single-chip 16-bit microcontroller
Preliminary specification
XA-H4
ClkOut
A
RAS (CS)
CAS (BHE/BLE)
OE
D
t_CHAH
RAS ADDRESS
t_CHAV
t_AVSL
t_CHSL
t_CHAV
CAS ADDRESS
t_CHSH
t_AVSL
t_CHSL
t_DIS
VALID DATA
t_CHSH
t_OHDE
t_DIH
Note 2
Figure 10. DRAM Single Read Cycle
SU01279
ClkOut
A
RAS (CS)
t_CHAH
RAS ADDRESS
t_CHAV
t_AVSL
t_CHSL
CAS (BHE/BLE)
t_CHAH
CAS ADDRESS
t_CHAV
t_CHAV
t_CHAH
CAS ADDRESS +2
t_CHSH
t_AVSL
t_CHSL
t_CPWH
t_CPWL
t_CHSH
OE
D[15:0]
Driven by XA
Note 3
Driven by Slave Device
Note 4
t_DIS
Word (from CAS Addr)
t_OHDE
t_DIS
Note 4
Word (from CAS Addr +2)
4 Byte Fetch (1 Word = 2 Bytes) is shown on 16-bit bus, burst can be 2 to 16 bytes (1 to 8 words).
Figure 11. DRAM EDO Burst Code Fetch on 16-Bit Bus
SU01280
1999 Sep 24
33