参数资料
型号: EPM7128B
厂商: Altera Corporation
英文描述: Programmable Logic Device Family(MAX7000B可编程逻辑系列器件)
中文描述: 可编程逻辑器件系列(MAX7000B可编程逻辑系列器件)
文件页数: 10/125页
文件大小: 1053K
代理商: EPM7128B
10
Altera Corporation
MAX 7000B Programmable Logic Device Family Data Sheet
Preliminary Information
Parallel Expanders
Parallel expanders are unused product terms that can be allocated to a
neighboring macrocell to implement fast, complex logic functions.
Parallel expanders allow up to 20 product terms to directly feed the
macrocell
OR
logic, with five product terms provided by the macrocell and
15 parallel expanders provided by neighboring macrocells in the LAB.
The MAX+PLUS II Compiler can automatically allocate up to three sets of
up to five parallel expanders to the macrocells that require additional
product terms. Each set of five parallel expanders incurs a small,
incremental timing delay (
t
PEXP
). For example, if a macrocell requires 14
product terms, the Compiler uses the five dedicated product terms within
the macrocell and allocates two sets of parallel expanders; the first set
includes five product terms and the second set includes four product
terms, increasing the total delay by 2
×
t
PEXP
.
Two groups of eight macrocells within each LAB (e.g., macrocells 1
through 8, and 9 through 16) form two chains to lend or borrow parallel
expanders. A macrocell borrows parallel expanders from lower-
numbered macrocells. For example, macrocell 8 can borrow parallel
expanders from macrocell 7, from macrocells 7 and 6, or from macrocells
7, 6, and 5. Within each group of eight, the lowest-numbered macrocell
can only lend parallel expanders and the highest-numbered macrocell can
only borrow them.
Figure 4
shows how parallel expanders can be
borrowed from a neighboring macrocell.
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