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參數(shù)資料
| 型號： | XC2C256-6TQG144C |
| 廠商： | Xilinx Inc |
| 文件頁數(shù)： | 11/16頁 |
| 文件大小： | 0K |
| 描述： | IC CR-II CPLD 256MCELL 144-TQFP |
| 標準包裝： | 60 |
| 系列： | CoolRunner II |
| 可編程類型： | 系統(tǒng)內(nèi)可編程 |
| 最大延遲時間 tpd(1)： | 5.7ns |
| 電壓電源 - 內(nèi)部： | 1.7 V ~ 1.9 V |
| 邏輯元件/邏輯塊數(shù)目： | 16 |
| 宏單元數(shù)： | 256 |
| 門數(shù)： | 6000 |
| 輸入/輸出數(shù)： | 118 |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 144-LQFP |
| 供應商設備封裝： | 144-TQFP（20x20） |
| 包裝： | 托盤 |
| 配用： | 122-1573-ND - KIT STARTER COOLRUNNER-II LP/LC 122-1512-ND - KIT DESIGN CPLD W/BATT HOLDER |
CoolRunner-II CPLD Family
4
DS090 (v3.1) September 11, 2008
Product Specification
R
path. The BSC and ISP block has the JTAG controller and
In-System Programming Circuits.
Function Block
The CoolRunner-II CPLD FBs contain 16 macrocells, with
40 entry sites for signals to arrive for logic creation and con-
nection. The internal logic engine is a 56 product term PLA.
All FBs, regardless of the number contained in the device,
are identical. For a high-level view of the FB, see Figure 2.
At the high level, the product terms (p-terms) reside in a
programmable logic array (PLA). This structure is extremely
flexible, and very robust when compared to fixed or cas-
caded product term FBs.
Classic CPLDs typically have a few product terms available
for a high-speed path to a given macrocell. They rely on
capturing unused p-terms from neighboring macrocells to
expand their product term tally, when needed. The result of
this architecture is a variable timing model and the possibil-
ity of stranding unusable logic within the FB.
The PLA is different — and better. First, any product term
can be attached to any OR gate inside the FB macrocell(s).
Second, any logic function can have as many p-terms as
needed attached to it within the FB, to an upper limit of 56.
Third, product terms can be re-used at multiple macrocell
OR functions so that within a FB, a particular logical product
need only be created once, but can be re-used up to 16
times within the FB. Naturally, this plays well with the fitting
software, which identifies product terms that can be shared.
The software places as many of those functions as it can
into FBs, so it happens for free. There is no need to force
macrocell functions to be adjacent or any other restriction
save residing in the same FB, which is handled by the soft-
ware. Functions need not share a common clock, common
set/reset, or common output enable to take full advantage of
the PLA. Also, every product term arrives with the same
time delay incurred. There are no cascade time adders for
putting more product terms in the FB. When the FB product
term budget is reached, there is a small interconnect timing
penalty to route signals to another FB to continue creating
logic. Xilinx design software handles all this automatically.
Figure 1: CoolRunner-II CPLD Architecture
Function
Block 1
Function
Block n
PLA
I/O
Blocks
I/O
Blocks
16
40
16 FB
16
I/O Pin
MC1
MC2
MC16
MC1
MC2
MC16
DS090_01_121201
AIM
I/O Pin
Direct Inputs
BSC and ISP
Clock and Control Signals
BSC Path
Direct Inputs
I/O Pin
JTAG
Figure 2: CoolRunner-II CPLD Function Block
PLA
16
40
3
MC1
Out
To AIM
Global
Clocks
Global
Set/Reset
MC2
MC16
DS090_02_101001
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