MOD5234-100IR NetBurner Inc, MOD5234-100IR Datasheet - Page 120

• Manufacturer Part Number: MOD5234-100IR
• Description: MOD5234 10/100 ETHERNET MODULE
• Manufacturer: NetBurner Inc
• Type: Controllers & Processorsr

Specifications of MOD5234-100IR

• Interface: I²C, SPI, UART
• Voltage - Supply: 2.5V
• Mounting Type: Surface Mount
• Package / Case: Module
• Product: Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Format: -
• Baud Rates: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q4483564

Enhanced Multiply-Accumulate Unit (EMAC)
In
pipeline minus 1. The minus 1 factor is needed because the OEP and EMAC pipelines overlap by
a cycle, the AGEX stage. As the store-accumulator instruction reaches the AGEX stage where the
operation is performed, the just-updated accumulator 0 value is available.
As with change or use stalls between accumulators and general-purpose registers, introducing
intervening instructions that do not reference the busy register can reduce or eliminate
sequence-related store-MAC instruction stalls. In fact, a major benefit of the EMAC is the addition
of three accumulators to minimize stalls caused by exchanges between the accumulator(s) and the
general-purpose registers.
4.5.2
MACSR[S/U,F/I] selects one of the following three modes, where each mode defines a unique
operand type.
This format can represent numbers in the range -1 < operand < 1 - 2
For words and longwords, the largest negative number that can be represented is -1, whose internal
representation is 0x8000 and 0x8000_0000, respectively. The largest positive word is 0x7FFF or
(1 - 2
4.5.3
MAC opcodes are described in the ColdFire Programmer’s Reference Manual.
Note the following:
4-14
Figure
• Two’s complement signed integer: In this format, an N-bit operand value lies in the range
• Unsigned integer: In this format, an N-bit operand value lies in the range 0 < operand < 2
• Two’s complement, signed fractional: In an N-bit number, the first bit is the sign bit. The
• Unless otherwise noted, the value of MACSR[N,Z] is based on the result of the final
-15
-2
- 1. The binary point is right of the lsb.
remaining bits signify the first N-1 bits after the binary point. Given an N-bit number,
a
operation that involves the product and the accumulator.
); the most positive longword is 0x7FFF_FFFF or (1 - 2
N-1
(N-1)
4-8, the OEP stalls the store-accumulator instruction for 3 cycles: the depth of the EMAC
Data Representation
MAC Opcodes
a
N-2
< operand < 2
a
Figure 4-9. Two’s Complement, Signed Fractional Equation
N-3
... a
2
value
a
1
a
0
(N-1)
, its value is given by the equation in
=
- 1. The binary point is right of the lsb.
MCF5235 Reference Manual, Rev. 2
–
(
1 a
⋅
N 1
–
)
+
N 2
i
∑
=
–
0
2
(
i
+
1 N
-31
–
Figure
).
)
(N-1)
⋅
ai
.
4-9.
Freescale Semiconductor
N