XA-SCC NXP Semiconductors, XA-SCC Datasheet - Page 34

• Manufacturer Part Number: XA-SCC
• Description: Cmos 16-bit Communications Microcontroller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
1999 Feb 23
CLKOUT
CASL/CASH
RAS (CS)
CAS (BHE/BLE)
CMOS 16-bit communications microcontroller
CLKOUT
D[15:0]
NOTE: The processor can prefetch from one to eight words (1 word = 2 bytes)
D[15:0]
RAS
OE
t
CHAV
A
OE
A
4 Byte Fetch (1 word = 2 bytes) is shown on 16 bit bus, burst can be 2 to 16 bytes (1 to 8 words.)
Note 4: To meet hold time, EDO DRAM drives valid Data until OE rises, or until new falling edge of CAS.
DRIVEN BY XA
t
CHAV
t
CHSL
t
AVSL
tAVSL
RAS ADDRESS
RAS ADDRESS
t
CHSL
t
CHSL
t
CHAV
t
CHAH
Figure 14. DRAM FPM (Fast Page Mode) Burst Code Fetch
NOTE 3
Figure 13. DRAM EDO Burst Code Fetch on 16 Bit Bus
DRIVEN BY SLAVE DEVICE
t
CHAH
t
CHAV
t
CHSL
t
AVSL
t
AVSL
CAS ADDRESS
t
t
CHAH
CHSL
CAS ADDRESS
34
INSTRUCTION
(from CAS ADDR)
t
t
DIS
CHAH
t
t
DIS
WORD
CHSH
t
t
CHAV
CHAV
t
CPWH
CAS ADDRESS + 2
t
CHSH
NOTE 4
NOTE 2
t
CHAH
t
t
CPWH
CPWL
CAS ADDRESS + 2
(from CAS ADDR + 2)
t
DIS
WORD
Preliminary specification
INSTRUCTION
t
CHAH
t
XA-SCC
DIS
NOTE 4
t
OHDE
t
CHSH
t
t
CHAV
CHSH
SU01134
SU01135
NOTE 2