UPSD3312D datasheet(172/272 Pages) STMICROELECTRONICS

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27.2.3

Specifying the memory map with PSDsoft Express

The memory map example shown in Figure 52 is implemented using PSDsoft Express in a

point-and-click environment. PSDsoft Express will automatically generate Hardware

Definition Language (HDL) statements of the ABEL language for the DPLD, such as those

shown in Table 114 on page 172.

Specifying these equations using PSDsoft Express is very simple. For example, Figure 53

on page 173, shows how to specify the chip-select equation for the 16 Kbyte Flash memory

segment, fs4. Notice fs4 is on memory page 1. This specification process is repeated for all

other Flash memory segments, the SRAM, the csiop register block, and any external chip

select signals that may be needed.

Table 114.

HDL statement example generated from PSDsoft for memory map

rs0 =

((address

≥

^h0000)

(address

≤

^h1FFF));

csiop =

((address

≥

^h2000)

(address

≤

^h20FF));

fs0 =

((address

≥

^h0000)

(address

≤

^h3FFF));

fs1 =

((address

≥

^h4000)

(address

≤

^h7FFF));

fs2 =

((page == 0)

(address

≥

^h8000)

(address

≤

^hBFFF));

fs3 =

((page == 0)

(address

≥

^hC000)

(address

≤

^hFFFF));

fs4 =

((page == 1)

(address

≥

^h8000)

(address

≤

^hBFFF));

fs5 =

((page == 1)

(address

≥

^hC000)

(address

≤

^hFFFF));

fs6 =

((page == 2)

(address

≥

^h8000)

(address

≤

^hBFFF));

fs7 =

((page == 2)

(address

≥

^hC000)

(address

≤

^hFFFF));

csboot0 =

((address

≥

^h8000)

(address

≤

^h9FFF));

csboot1 =

((address

≥

^hA000)

(address

≤

^hBFFF));

csboot2 =

((address

≥

^hC000)

(address

≤

^hDFFF));

csboot3 =

((address

≥

^hE000)

(address

≤

^hFFFF));

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