PSD835G2 datasheet(43/110 Pages) STMICROELECTRONICS

Nome de Peças	PSD835G2

Descrição Electrónicos	Configurable Memory System on a Chip for 8-Bit Microcontrollers

PDF	110 Pages

Scroll/Zoom	100%

Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

Página de início	http://www.st.com

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43 / 110 page

PSD8XX Family

PSD835G2

MASTER

MCU

MCU - RD

MCU - WR

SLAVE – WR

SLAVE – CS

MCU - WR

D [ 7:0]

CPLD

PORT A

DATA OUT

PORT A

INPUT

MICRO ⇔ CELL

PORT A

SLAVE – READ

SLAVE

MCU

PSD835G2

Figure 15. Handshaking Communication Using Input Micro⇔Cells

The

PSD835G2

Functional

Blocks

(cont.)

9.2.2.7 External Chip Select

The CPLD also provides eight chip select outputs that can be used to select external

devices. The chip selects can be routed to either Port C or Port F, depending on the pin

declaration in the PSDsoft. Each chip select (ECS0-7) consists of one product term that can

be configured active high or low.

The output enable of the pin is controlled by either the output enable product term or the

Direction Register. (See Figure 16).

CPLD

AND

ARRAY

ECS PT

PORT C OR PORT F

ECS

TO PORT C OR F

ENABLE (.OE) PT

POLARITY

BIT

DIRECTION

PORT PIN

Figure 16. External Chip Select

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