Application With 80C165; Dual Port Ram Controller - Profichip VPC3+S User Manual

8.1.8

Application with 80C165

µC
µC
µC
µC
µC
AB(10..0)
8.2

Dual Port RAM Controller

The internal 4K Byte RAM of the VPC3+S is a single-port RAM. An
integrated Dual-Port RAM controller, however, permits an almost
simultaneous access of both ports (bus interface and microsequencer
interface). When there is a simultaneous access of both ports, the bus
interface has priority. This guarantees the shortest possible access time. If
the VPC3+S is connected to a microcontroller with an asynchronous
interface, the controller can evaluate the Ready signal.
VPC3+S User Manual
Copyright © profichip GmbH, 2012
VPC3+
5
48 MHz
8
GND
1K
36
1
23
GND
1K
24
GND
1K
2
XWRL
XRD
4
34
3K3
VDD
35
VDD 3K3
3
connect to
VDD or GND
AB0 44
AB1 43
AB2 41
AB3 40
37
AB4
AB5 42
32
AB6
AB7 31
AB8 29
25
AB9
AB10 10
Figure 8-27: 80C165 Application
Revision 1.04
Hardware Interface 8
CLK
XINT/MOT
CLK2
RESET XDATAEX
XCS XREADY
MODE
ALE X/INT
XWR
XRD
XTEST0 XCTS
XTEST1
DIVIDER RXD
RTS
AB0 TXD
AB1
AB2
DB0
AB3
DB1
AB4
DB2
AB5
DB3
AB6
DB4
AB7
DB5
AB8
DB6
AB9
DB7
AB10
7
13
LED for Data_Exchange
14
µC
9
µC
33
GND
1K
30
RS485
27
RS485
26
RS485
11
DB0
12
DB1
15
DB2
16
DB3
19
DB4
20
DB5
21
DB6
22
DB7
µC
DB(7..0)
107