peb20534 Infineon Technologies Corporation, peb20534 Datasheet - Page 100

• Manufacturer Part Number: peb20534
• Description: Dma Supported Serial Communication Controller With 4 Channels
• Manufacturer: Infineon Technologies Corporation

Figure 24
6.1.1.3
The de-multiplexed bus modes use the LBI port pins LA(15:0) for the 16-bit address and
the LBI port pins LD(15:0) for 8/16-bit data. The EBC initiates an external access by
placing an address on the address bus. The EBC then activates the respective
command signal (LRD, LWR, LBHE). Data is driven onto the data bus either by the EBC
(for write cycles) or by the external memory/peripheral (for read cycles). After a period of
time, which is determined by the access time of the memory/peripheral, data become
valid.
Read cycles:
causes the accessed device to remove its data from the data bus which is then tri-stated
again.
Write cycles:
is required, the EBC places the respective address on the address bus. The data remain
valid on the bus until the next external bus cycle is started.
Data Sheet
LALE
Data IN
LRD
Data OUT
LWR
De-multiplexed Local Bus Modes
The command signal is now deactivated. If a subsequent external bus cycle
Input data is latched and the command signal is now deactivated. This
Multiplexed Bus Cycle
Address
Extended ALE
Address
100
Data
Data
Multi Function Port (MFP)
PEB 20534
PEF 20534
2000-05-30
ITD10611