ia186xl Innovasic Semiconductor Inc., ia186xl Datasheet - Page 42

• Manufacturer Part Number: ia186xl
• Description: 16-bit Microcontroller
• Manufacturer: Innovasic Semiconductor Inc.

IA186XL/IA188XL
16-Bit Microcontrollers
The IA186XL can generate chip selects for up to seven peripheral devices. These chip selects
are active for seven contiguous blocks of 128 bytes above a programmable base address. The
base address may be located in either memory or I/O space. The IA186XL can generate a
READY signal internally for each of the memory or peripheral CS lines. The number of WAIT
states to be inserted for each peripheral or memory is programmable to provide 0±3 wait states
for all accesses to the area for which the chip select is active. In addition, the IA186XL may be
programmed to ignore either external READY for each chip-select range individually or to factor
external READY with the integrated ready generator. At reset, the Chip-Select/Ready Logic will
perform the following actions:
4.1.6 DRAM Refresh Control Unit
The Refresh Control Unit (RCU) automatically generates DRAM refresh bus cycles. The RCU
operates only in Enhanced Mode. After a programmable period of time, the RCU generates a
memory read request to the BIU. If the address generated during a refresh bus cycle is within the
1. All chip-select outputs will be driven HIGH
2. Upon leaving RESET, the UCS line will be programmed to provide chip selects to a
3. No other chip select or READY control registers have any predefined values after
1-Kbyte block with the accompanying READY control bits set at 011 to insert 3 wait
states in conjunction with external READY (i.e., UMCS resets to FFFBH)
RESET. They will not become active until the CPU accesses their control registers.
®
Chip-Select Control Registers
Figure 12. Internal Register Map
Interrupt Controller Registers
DMA Descriptors Channel 1
DMA Descriptors Channel 0
Time 2 Control Registers
Time 1 Control Registers
Time 0 Control Registers
UNCONTROLLED WHEN PRINTED OR COPIED
Relocation Register
ENG211080711-01
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OFFSET
DAH
CAH
FEH
D0H
C0H
A8H
A0H
5EH
3EH
66H
60H
58H
56H
50H
20H
Preliminary Data Sheet
September 30, 2008
http://www.Innovasic.com
Customer Support:
1-888-824-4184