Copyright © Siemens AG 2016. All rights reserved
455
ERTEC 200P-2 Manual
Technical data subject to change
Version
1.0
CLK_I_BF
XCS_PERy
A[23:0]
D[31:0]
XRD
(xoe_async)
XAV_BF
t
R_SU
t
R_HOLD
XRDY_BF
*)
DN
Address Latched
Wait States Inserted
D1
D2
D3
D4
Adr
Data valid
x = 0, 1, 2
y = 0, 1, 2, 3
t
R_STROBE
t
AD
t
AW
CLK_O_BFx
Wait States Inserted
Data valid
XRDY_BF
**)
CLK_SYS
Notes:
(1) XRDY_BF active with BF_CONFIG.RDY_DELAY = 0
(2) XRDY_BF active with BF_CONFIG.RDY_DELAY = 1
Parameter Description
Min
Max
depends on Register
t
R_SU
Read Setup-Time
t
AD
+
t
AW
120 ns ASYNC_BANKx.R_SU
t
R_STROBE
Read
Strobe-Time
8 ns
512 ns ASYNC_BANKx.R_STROBE
t
R_HOLD
Read Hold-Time
8 ns
64
ns
ASYNC_BANKx.R_HOLD
t
AD
Address Valid Delay
8 ns
128 ns
1)
BF_CONFIG.AVD_DELAY
t
AW
Address Valid Pulse Width 8 ns
64 ns
1)
BF_CONFIG.AVD_PW
1)
t
AD
+t
AW
t
R_SU
must be ensured
3.3.1.3 SDRAM Timing
The combination of the control signals XCS_DRAM, XRAS_SDRAM, XCAS_SDRAM,
XWE_SDRAM and XBEy_DQMy together with the Address bus is defining SDRAM com-
mands in the following way:
SDRAM com-
mand
X
C
S
_
S
D
R
A
M
M
M
X
W
E
_
S
D
R
A
M
X
B
E
y
_
D
Q
M
y
A
Description
COMMAND
INHIBIT
1 X X X
X
X
No
operation
Содержание ERTEC 200P
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