Siemens ERTEC200 Manuel D’Utilisation
7.5.3
LBU Read from ERTEC 200 with common Read/Write line (LBU_RDY_N active low)
LBU_CS_R_N/
LBU_CS_M_N
LBU_CS_M_N
LBU_WR
LBU_A(20:0)/
LBU_SEG(1:0)/
LBU_BE(1:0)_N
LBU_SEG(1:0)/
LBU_BE(1:0)_N
LBU_RDY
LBU_D(15:0)
t
WCS
t
ACS
t
CRE
t
CDE
t
RTD
t
CDH
t
CAH
t
CWH
t
RAP
t
RR
Figure 15: LBU-Read-Sequence with common RD/WR line
Parameter Description
Min
Max
t
WCS
write signal deasserted to chip select asserted setup time
2 ns
t
ACS
address valid to chip select asserted setup time
0 ns
t
CRE
chip select asserted to ready enabled delay
5 ns
12 ns
t
CDE
chip select asserted to data enable delay
5 ns
12 ns
t
RAP
ready active pulse width
17 ns
23 ns
t
RTD
ready asserted to data valid delay
5 ns
t
CWH
write signal inactive to chip select deasserted hold time
0 ns
t
RAH
address valid to chip select deasserted hold time
0 ns
t
RDH
data valid/enabled to chip select deasserted hold time
0 ns
12 ns
t
RR
read recovery time
25 ns
Table 27: LBU Read access timing with common Read/Write line
Copyright © Siemens AG 2007. All rights reserved.
81
ERTEC 200 Manual
Technical data subject to change Version 1.1.0