EZ80190AZ050SC00TR Zilog, EZ80190AZ050SC00TR Datasheet - Page 127

• Manufacturer Part Number: EZ80190AZ050SC00TR
• Description: IC EZ80 ACCLAIM 50MHZ 100LQFP
• Manufacturer: Zilog

Specifications of EZ80190AZ050SC00TR

• Processor Type: eZ80
• Features: High Speed, Single-Cycle Instruction-Fetch
• Speed: 50MHz
• Voltage: 3.3V
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

MACC Dual Bank Operation
Table 57. MACC DATA Bank Status Codes
PS006614-1208
DATA Bank Status
MACC_STAT[1:0]
00b
Alternatives to OTI2R and INI2R
Caution:
Alternatively, any write operation to any of the MACC registers besides MACC_STAT
also changes the DATA bank status from DONE to EMPTY. This state change occurs
because write operations generally indicate a requirement to define a new calculation.
The INI2R and OTI2R instructions are recommended for CPU input and output access to
the MACC control registers. However, it is not required that only these instructions be
employed. Other I/O instructions can also be used.
The Multiply-Accumulator is divided into two separate operating banks. As a result, one
bank of the MACC performs a set of multiply-accumulate operations on a set of data while
the eZ80190 device is preparing the other bank for the next set of multiply-accumulate
operations. Each bank features a separate accumulator and a separate set of control regis-
ter values (MACC_xSTART, MACC_xEND, MACC_xRELOAD, MACC_ySTART,
MACC_yEND, MACC_yRELOAD, and MACC_LENGTH).
The MACC bank that is currently accessible in the eZ80190 device’s I/O space is referred
to as the DATA bank. The MACC bank that is currently available for use by the MACC
for execution is referred to as the CALC bank. The current state of the DATA bank is pro-
vided by the DATA_STAT field (bits [1:0]) of the MACC_STAT register. The current
state of the CALC bank is provided by the CALC_STAT field (bits [3:2]) of the
MACC_STAT register. An explanation of each bank status code is listed in
Table 58
Care must be taken to ensure that the High byte of the I/O address, ADDR[15:8], is only
set to
01h
on page 118.
Description
The DATA bank is EMPTY. No calculation is set up for
execution.
when a state change is required on the MACC DATA and CALC banks.
Product Specification
Multiply-Accumulator
Table 57
eZ80190
and
117