IA59032_08 Datasheet, PDF (8/19 Pages) InnovASIC, Inc – 32-Bit High-Speed Microprocessor Slice

IA59032
32-Bit High-Speed Microprocessor Slice
Data Sheet
August 19, 2008
A detailed block diagram for the IA59032 is shown in Error! Reference source not found.. The
two key elements in the block diagram are the 32 word by 32-bit 2-port RAM and the high-speed
ALU.
Data in any of the 32 words of the RAM can be read from the A-port of the RAM as controlled by
the 4-bit A address field input. Likewise, data in any of the 32 words of the RAM as defined by the
B address field input can be simultaneously read from the B-port of the RAM. The same code can
be applied to the A select field and B select field in which case the identical file data will appear at
both the RAM A-port and B-port outputs simultaneously.
When enabled by the RAM write enable (CP low), new data is always written into the file (word)
defined by the B address field of the RAM. The RAM data input field is driven by a 3-input mux.
This configuration is used to shift the ALU output data F if desired. This three-input mux scheme
allows the data to be shifted up one bit position, shifted down one bit position, or not shifted in
either direction.
The high speed ALU can perform three binary arithmetic and five logic operations on the two 32-bit
input words R and S. The R input field is driven from a 2-input mux, while the S input field is
driven by a 3-input mux. Both muxes also have an inhibit capability; that is, no data is passed. This
is equivalent to a “zero” source operand.
Referring to Error! Reference source not found., the ALU R-input mux has the RAM A-port and
the direct data inputs (D) connected as inputs. Likewise, the ALU S-input mux has the RAM A-
port, B-port, and the Q register connected as inputs.
This muxing scheme provides the capability of selecting various pairs of the A, B, D, Q, and zero
inputs as source operands to the ALU. These five inputs, when taken two at a time, result in ten
possible combinations of source operand pairs. The I(2:0) inputs are the microinstruction inputs
used to select the ALU source operands.
The two source operands not fully described as yet are the D input and the Q input. The D input is
the 32-bit wide direct data field input. This port is used to insert all data into the working registers
inside the device. Likewise, this input can be used in the ALU to modify any of the internal data
files. The Q register is a separate 32-bit file intended primarily for multiplication and division
routines but it can also be used as an accumulator or holding register for some applications.
The ALU itself is capable of performing three binary arithmetic and five logic functions. The I(5:3)
inputs are used to select the ALU function.
The ALU has three status-oriented outputs. These are F31, FZERO, and OVR. The F31 output is
the most significant (sign) bit of the ALU and can be used to determine positive or negative results
without enabling the three-state data outputs. F31 is non-inverted with respect to the sign bit
output Y(31). The FZERO output is used for zero detect. It is an open-collector output. FZERO
is HIGH when all F outputs are LOW. The overflow output (OVR) is used to flag arithmetic
operations that exceed the available two’s complement number range. The OVR output is HIGH
when overflow exists.
IA211001108-03
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