ACS411CS Semtech Corporation, ACS411CS Datasheet - Page 21

• Manufacturer Part Number: ACS411CS
• Description: Acapella Optical Modem ic
• Manufacturer: Semtech Corporation

In EPROM mode, the ACS4110 takes control of the
bus as master, and reads the device set-up from an
AMD AM27C020 type EPROM at lowest speed
(250ns) after device start-up (system reset). The
EPROM access state machine in the up interface
sequences the accesses. The following figures show
the timing diagrams of the read access for this mode.
For a more detailed timing specification, see AMD
Am27C020 data sheet, July 1993, p. 2-95.
uP Interface timing - EPROM mode
Note: preliminary timing information. Timing values marked with * TBA.
Note: preliminary timing information. Timing values marked with * TBA.
AD
CSB (= OEB)
A
A(0) = SDI
AD(0) = SDO
CSB
ALE = SCLK
R/W
Z
Symbol
A0
Symbol
Figure 11: Write access timing in SERIAL Mode.
tacc
Figure 12: Read access timing in EPROM Mode.
tpw1
tpw2
tsu1
tsu2
th1
th2
tp
address
A1
Delay CSB or A change to AD valid
Setup SDI valid to SCLK
Setup CSB to SCLK
SCLK low time
SCLK high time
(CSB
Z
Hold SDI to SCLK
Hold SCLK
Time between consecutive accesses
A2
A3
to CSB )
Parameter
Parameter
A4
to CSB
data
A5
21
A6
If the microprocessor interface is enabled (UPSEL /
= 0), the default start-up values are taken over from
the pin values as default during reset for the following
control pins:
CM(3:1)
CKC, CKM, TRSEL , RESEL
MSEL(3:1), ENRSB
DR(3:1)
D0
Min
10 *
10 *
10 *
10 *
240
240
250
D1
Min
-
D2
Typ
Typ
-
D3
Max
Max
D4
590
Z
ACS411CS PRE-RELEASE Issue 6.0 July 1999.
D5
D6
D7