Profichip VPC3+S - Timing in the Asynchronous Motorola Mode

10 Operational Specifications
120
Revision 1.04
VPC3+S User Manual
Copyright © profichip GmbH, 2012
10.6.5 Timing in the Asynchronous Motorola Mode
In the asynchronous Motorola mode, the VPC3+S acts like a memory with
Ready logic, whereby the access times depend on the type of access.
The request for an access of the VPC3+S is generated from the falling
edge of the AS signal (in addition: XCS = '0', R_W = '1'). The request for a
write access is generated from the rising edge of the AS signal (in addition:
XCS = '0', R_W = '0').
AB10..0
DB7..0
valid
data valid
XCS
XDTACK
(normal)
XDTACK
(early)
AS
R_W
56
57
55
54
53
52
44
43
45
46
48
49
47
51
50
Figure 10-17: Asynchronous Motorola Mode, READ (E_CLOCK = 0)