EP3C5E144A7N Altera, EP3C5E144A7N Datasheet - Page 40
EP3C5E144A7N
Manufacturer Part Number
EP3C5E144A7N
Description
Cyclone III
Manufacturer
Altera
Datasheet
1.EP3C5E144A7N.pdf
(274 pages)
Specifications of EP3C5E144A7N
Family Name
Cyclone III
Number Of Logic Blocks/elements
5136
# I/os (max)
94
Frequency (max)
437.5MHz
Process Technology
65nm
Operating Supply Voltage (typ)
1.2V
Logic Cells
5136
Ram Bits
423936
Operating Supply Voltage (min)
1.15V
Operating Supply Voltage (max)
1.25V
Operating Temp Range
-40C to 125C
Operating Temperature Classification
Automotive
Mounting
Surface Mount
Pin Count
144
Package Type
EQFP
Lead Free Status / Rohs Status
Compliant
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3–4
Byte Enable Support
Cyclone III Device Handbook, Volume 1
The Cyclone III device family M9K memory blocks support byte enables that mask
the input data so that only specific bytes of data are written. The unwritten bytes
retain the previous written value. The wren signals, along with the byte-enable
(byteena) signals, control the write operations of the RAM block. The default value
of the byteena signals is high (enabled), in which case writing is controlled only by
the wren signals. There is no clear port to the byteena registers. M9K blocks support
byte enables when the write port has a data width of ×16, ×18, ×32, or ×36 bits.
Byte enables operate in one-hot manner, with the LSB of the byteena signal
corresponding to the least significant byte of the data bus. For example, if
byteena = 01 and you are using a RAM block in ×18 mode, data[8..0] is
enabled and data[17..9] is disabled. Similarly, if byteena = 11, both
data[8..0] and data[17..9] are enabled. Byte enables are active high.
Table 3–2
Table 3–2. byteena for Cyclone III Device Family M9K Blocks
Note to
(1) Any combination of byte enables is possible.
byteena[3..0]
[0] = 1
[1] = 1
[2] = 1
[3] = 1
Table
lists the byte selection.
3–2:
datain
[15..8]
[7..0]
—
—
× 16
datain
[17..9]
[8..0]
—
—
Chapter 3: Memory Blocks in the Cyclone III Device Family
× 18
Affected Bytes
datain
(Note 1)
[23..16]
[31..24]
[15..8]
[7..0]
© December 2009 Altera Corporation
× 32
datain
[26..18]
[35..27]
[17..9]
[8..0]
× 36
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