IA188EM-PQF100I-R datasheet(16/133 Pages) INNOVASIC

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IA186EM/IA188EM

Data Sheet

8/16-BIT Microcontrollers

As of Production Version -03

DSA [15:0] (bits 15-0) – DMA Source Address Low bits are placed onto a15-a0 during the read phase

of a DMA transfer.

MPCS (0a8h) - MCS and PCS Auxiliary Register.

This register controls more than one type of chip select, making it different from the other chip select

control registers. The MPCS register contains information for the following, mcs3_n - mcs0_n as well as

pcs6_n - pcs5_n and pcs3_n - pcs0_n.

The MPCS register also contains a bit that configures the pcs6_n - pcs5_n pins as either chip selects or as

alternate sources for the A2 and A1 address bits. Either address bits a1 & a2 or pcs6_n - pcs5_n are

selected to the exclusion of the other. When programmed for address bits, these outputs can be used to

provide latched address bits for a2 & a1

pcs6_n - pcs5_n are high and not active on processor reset. An access to the MPCS register causes the

pins to activate, when the pcs6_n - pcs5_n are configured as address pins. The pcs6_n - pcs5_n pins do

not require corresponding access to the PACS register to be activated.

The value of the MPCS register is undefined at reset.

5 4 3

M6-M0

EX MS 1 1 1 R2

R1-R0

Reserved (bit 15) – Set to 1.

M [6:0] (bits14-8) MCS_n Block Size – These seven bits determine the total block size for the

MCS3_n - MCS0_n chip selects. The total block size is divided equally among the four chip selects.

The following table shows the relationship between M [6:0] and the size of the memory block.

Total Block

Size

Individual

Select Size

M6 – M0

0000001b

16K

0000010b

32K

0000100b

64K

16K

0001000b

128K

32K

0010000b

256K

64K

0100000b

512K

128K

1000000b

EX (bit7) Pin Selector – This bit determines whether the pcs6_n - pcs5_n pins are configured as chip

selects or as alternate outputs for a2 & a1. When this bit is set to 1, pcs6_n - pcs5_n are configured

as peripheral chip select pins, whereas when set to 0, pcs6_n - pcs5_n become address bit a1 and

address bit a2 respectively.

3737 Princeton NE, Ste 130 • Albuquerque, NM 87107 • Tel 505.883.5263 • Fax 505.883.5477 • www.Innovasic.com

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