IA188EM-PQF100I-R datasheet(129/133 Pages) INNOVASIC

129 / 133 page

IA186EM/IA188EM

Data Sheet

8/16-BIT Microcontrollers

As of Production Version -03

Errata

Version -01

1) Problem: MCS chip select signals (MCS0-3) are intermittently suppressed. All other signals in bus cycle

appear correct (i.e. address, data, write/read strobes).

Analysis: Anomaly occurs when an access to I/O space is immediately followed by an MCS access. Given the

way instruction prefetches naturally separate such accesses, one known scenario for this anomaly is via a DMA

sequence. Possible combinations are:

(1) DMA write to destination is followed by previously scheduled

MCS read or write,

(2) DMA from I/O space to MCS space.

Customers using the UART DMA feature of the ES products may be particularly sensitive to this,

because when the TX data register of the PCB is in I/O space, eventually an MCS access will be

corrupted.

Another known scenario occurs when auxiliary flash (containing executable code) is selected by an

MCS signal and the PCB or PCS selects are in I/O space.

The PCB register block and the PCS address spaces are the only areas that can be assigned to I/O

space. The PCB register block is configured by bit 12 of the RELREG, and defaults to I/O space.

PCS space is configured by bit 6 of the MPCS, and must be initialized by the user.

Workaround: If possible, assign PCB and PCS address locations to memory space instead of I/O space.

2) Problem: IA186ES devices do not work in a 188ES socket.

Analysis: The WHB pin should be sampled at reset to configure the bus width. This pin is always

grounded in 188 applications, and floats high during reset in 186 applications. The bus width of the

Innovasic devices are configured via in-package bonding.

Workaround: Use IA188ES devices for 188 sockets.

3) Problem: Noise on TMROUT0 (PIO10) and TMROUT1 (PIO1) when in PIO output mode.

Analysis: Only occurs when application is using HOLD/HLDA function, and either TMROUT pin is

in PIO output mode. Improper logic allows the TMROUT pin to tri-state when HLDA is asserted.

Analysis shows that UZI (PIO26), S6CLK2 (PIO29), DEN (PIO5), and DT_R (PIO4) may also be

affected. PIO input modes and normal operation modes are not affected.

Workaround: If possible, use a PIO pin other than those listed above when utilizing HOLD/HLDA feature. An

external pullup/pulldown may also help.

4) Problem: An extra DMA cycle occurs after ending DMA transfers via a DMA control register write. In certain

applications, this extra DMA cycle occurrence will hang the device because of DREQ/SRDY dependency.

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

IA188EM-PQF100I-R 数据表(PDF) 129 Page - InnovASIC, Inc

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