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H8SX1663 Scheda tecnica(PDF) 319 Page - Renesas Technology Corp

Il numero della parte H8SX1663
Spiegazioni elettronici  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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Section 6 Bus Controller (BSC)
Rev.1.00 Jun. 07, 2006 Page 267 of 1102
REJ09B0294-0100
6.11.11
Controlling Byte and Word Accesses
When 16-bit bus SDRAM is used, byte and word accesses are performed through the control of
DQMLU and DQMLL.
Figures 6.69 and 6.70 show control timing examples of the DQM signals in the big endian format.
Figure 6.71 shows a connection example when the DQM signals are used for the byte and word
control.
T
p
T
r
T
c1
T
cl
T
c2
Address bus
Row address
Column address
SD
φ
CS
Precharge-sel
RAS
CAS
WE
CKE
PALL
ACTV
READ
NOP
DQMLU
DQMLL
D7 to D0
BS
RD/
WR
D15 to D8
Row
address
High
High
Hi-Z
Figure 6.69 Control Timing Example of Byte Control by DQM in 16-Bit Access Space
(Read Access with Lowest Bit of Address = B'0)



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