PSD4135G2 datasheet(41/93 Pages) STMICROELECTRONICS

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PSD4000 Series

Preliminary Information

9.3.3 Data Byte Enable Reference

Microcontrollers have different data byte orientations. The following tables show how the

PSD4135G2 interprets byte/word operation in different bus write configurations. Even-byte

refers to locations with address A0 equal to zero and odd byte as locations with A0 equal

to one.

9.3.4 Microcontroller Interface Examples

Figures 14 through 17 show examples of the basic connections between the PSD4135G2

and some popular microcontrollers. The PSD4135G2 Control input pins are labeled as the

microcontroller function for which they are configured. The MCU interface is specified using

PSDsoft. The PE6 pin should be grounded if Vstby is not used.

9.3.4.1 80C196 and 80C186

In Figure 14, the Intel 80C196 microcontroller, which has a multiplexed sixteen-bit bus, is

shown connected to a PSD4135G2. The WR and RD signals are connected to the

CNTL0-1 pins. The BHE signal is used for high data byte selection. If BHE is not used, the

PSD can be configured to receive the WRL and WRH from the MCU. Higher address

inputs (A16-A19) can be routed to Port A, B or C as inputs to the PLD.

The AMD 80186 family has the same bus connection to the PSD as the 80C196.

BHE

D15-D8

D7-D0

Odd Byte

Even Byte

Odd Byte

–

Even Byte

Table 15. 16-Bit Data Bus with BHE

The

PSD4000

Functional

Blocks

(cont.)

WRH

WRL

D15-D8

D7-D0

Odd Byte

Even Byte

Odd Byte

–

Even Byte

Table 16. 16-Bit Data Bus with WRH and WRL

SIZ0

D15-D8

D7-D0

Even Byte

Odd Byte

Even Byte

–

Odd Byte

Table 17. 16-Bit Data Bus with SIZ0, A0 (Motorola MCU)

LDS

UDS

D15-D8

D7-D0

Even Byte

Odd Byte

Even Byte

–

Odd Byte

Table 18. 16-Bit Data Bus with UDS, LDS (Motorola MCU)

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