Rainbow Electronics AT75C310 - Manual (Page 28)

AT75C310
28
Read and Write Accesses Followed by CAS before RAS
Refresh
Figure 6 shows a read access followed by a write. As the
accesses are to different devices, there is no need for a
precharge cycle. The read is a byte access (one CAS strobe is active) and
the write is a half-word access (two CAS strobes are
active).
The CAS before RAS refresh cycle refreshes all DRAM
devices controlled by the DMC. All RAS and CAS strobes
are therefore active.
Figure 6. Read Access Followed by a Write
BCLK
RAS0
RAS1
CAS1
CAS2
CAS3
NDOE
NDWE
D (SIAP)
D (MEM)
A
CAS0