vivado BEL

描述
通常，BEL或基本元素对应于设计的网表视图中的叶单元。
BEL是目标Xilinx FPGA上的设备对象，用于放置或映射基本网表
触发器、LUT和进位逻辑等对象。
BEL在SITE对象（如SLICE和IO块）中的设备上分组在一起
（IOB）。一个或多个BEL可以位于单个SITE中，您可以使用BEL来分配
从设计网表到目标设备上的特定位置或设备资源的逻辑。
在不同的Xilinx FPGA上有许多不同的标签类型。这个
以下是Kintex®-7部件xc7k70tfbg676上的bels类型。不同的
BEL的类型列举如下

AFF AFF2

BFF BFF2

BITSLICE_CONTROL_BEL

BSCAN1 BSCAN2 BSCAN3 BSCAN4 BSCAN_BSCAN

BUFCE_BUFCE BUFCE_BUFCE_LEAF BUFCE_BUFCE_ROW

BUFFER

BUFGCE_DIV_BUFGCE_DIV BUFGCTRL_BUFGCTRL BUFG_GT_BUFG_GT BUFG_GT_BUFG_GT_SYNC

BUFHCE_BUFHCE BUFIO_BUFIO BUFMRCE_BUFMRCE BUFR_BUFR

CAPTURE_CAPTURE

CARRY4 CARRY8

CFF CFF2

CFG_IO_ACCESS

DCIRESET DCIRESET_DCIRESET

DFF DFF2

DNA_PORT DNA_PORT_DNA_PORT

DSP48E1_DSP48E1 DSP_ALU DSP_A_B_DATA DSP_C_DATA DSP_MULTIPLIER DSP_M_DATA

DSP_OUTPUT DSP_PREADD DSP_PREADD_DATA

EFF EFF2

EFUSE_USR EFUSE_USR_EFUSE_USR

F7MUX F8MUX F9MUX

FFF FFF2

FF_INIT

FIFO18E1_FIFO18E1

FRAME_ECC FRAME_ECC_FRAME_ECC

GCLK_DELAY

GFF GFF2

GTHE3_CHANNEL_GTHE3_CHANNEL

GTHE3_CHANNEL_IPAD1 GTHE3_CHANNEL_IPAD2

GTHE3_CHANNEL_OPAD1 GTHE3_CHANNEL_OPAD2

GTHE3_COMMON_GTHE3_COMMON

GTHE3_COMMON_PADN GTHE3_COMMON_PADP

GTXE2_CHANNEL_GTXE2_CHANNEL GTXE2_COMMON_GTXE2_COMMON

HARD0 HARD1

HARD_SYNC_SYNC_UNIT

HFF HFF2

HPIOBDIFFINBUF_DIFFINBUF HPIOBDIFFOUTBUF_DIFFOUTBUF

HPIOB_IBUFCTRL

HPIOB_INBUF HPIOB_OUTBUF

HPIOB_PAD HPIOB_PULL

HPIO_OUTINV HPIO_VREF

HRIODIFFINBUF_DIFFINBUF HRIODIFFOUTBUF_DIFFOUTBUF

HRIO_IBUFCTRL

HRIO_INBUF HRIO_OUTBUF

HRIO_OUTINV HRIO_PAD HRIO_PULL

IBUFDS0_GTE3 IBUFDS1_GTE3 IBUFDS_GTE2_IBUFDS_GTE2

ICAP_BOT ICAP_ICAP ICAP_TOP

IDELAYCTRL_IDELAYCTRL

IDELAYE2_FINEDELAY_IDELAYE2_FINEDELAY

IDELAYE2_IDELAYE2

ILOGICE2_IFF

ILOGICE3_IFF ILOGICE3_ZHOLD_DELAY

INVERTER

IN_FIFO_IN_FIFO

IOB18M_INBUF_DCIEN IOB18M_OUTBUF_DCIEN IOB18M_TERM_OVERRIDE

IOB18S_INBUF_DCIEN IOB18S_OUTBUF_DCIEN IOB18S_TERM_OVERRIDE

IOB18_INBUF_DCIEN IOB18_OUTBUF_DCIEN IOB18_TERM_OVERRIDE

IOB33M_INBUF_EN IOB33M_OUTBUF IOB33M_TERM_OVERRIDE

IOB33S_INBUF_EN IOB33S_OUTBUF IOB33S_TERM_OVERRIDE

IOB33_INBUF_EN IOB33_OUTBUF IOB33_TERM_OVERRIDE

LUT5 LUT6

LUT_OR_MEM5 LUT_OR_MEM6

MASTER_JTAG

MMCME2_ADV_MMCME2_ADV MMCME3_ADV_MMCM_TOP

OBUFDS0_GTE3 OBUFDS1_GTE3

ODELAYE2_ODELAYE2

OLOGICE2_MISR OLOGICE2_OUTFF OLOGICE2_TFF

OLOGICE3_MISR OLOGICE3_OUTFF OLOGICE3_TFF

OUT_FIFO_OUT_FIFO

PAD

PCIE_2_1_PCIE_2_1 PCIE_3_1_PCIE_3_1

PHASER_IN_PHY_PHASER_IN_PHY PHASER_OUT_PHY_PHASER_OUT_PHY

PHASER_REF_PHASER_REF

PHY_CONTROL_PHY_CONTROL

PLLE2_ADV_PLLE2_ADV PLLE3_ADV_PLL_TOP PLL_SELECT_BEL

PMV2_PMV2

PULL_OR_KEEP1

RAMB18E1_RAMB18E1 RAMB18E2_U_RAMB18E2 RAMBFIFO18E2_RAMBFIFO18E2

RAMBFIFO36E1_RAMBFIFO36E1 RAMBFIFO36E2_RAMBFIFO36E2

REG_INIT

RIU_OR_BEL

RXTX_BITSLICE

SELMUX2_1

SLICEL_A5LUT SLICEL_A6LUT

SLICEL_B5LUT SLICEL_B6LUT

SLICEL_C5LUT SLICEL_C6LUT

SLICEL_CARRY4_AMUX SLICEL_CARRY4_AXOR

SLICEL_CARRY4_BMUX SLICEL_CARRY4_BXOR

SLICEL_CARRY4_CMUX SLICEL_CARRY4_CXOR

SLICEL_CARRY4_DMUX SLICEL_CARRY4_DXOR

SLICEL_D5LUT SLICEL_D6LUT SLICEL_E5LUT

SLICEL_E6LUT SLICEL_F5LUT SLICEL_F6LUT

SLICEL_G5LUT SLICEL_G6LUT SLICEL_H5LUT

SLICEL_H6LUT SLICEM_A5LUT SLICEM_A6LUT

SLICEM_B5LUT SLICEM_B6LUT SLICEM_C5LUT

SLICEM_C6LUT SLICEM_CARRY4_AMUX SLICEM_CARRY4_AXOR

SLICEM_CARRY4_BMUX SLICEM_CARRY4_BXOR

SLICEM_CARRY4_CMUX SLICEM_CARRY4_CXOR

SLICEM_CARRY4_DMUX SLICEM_CARRY4_DXOR

SLICEM_D5LUT SLICEM_D6LUT

SLICEM_E5LUT SLICEM_E6LUT

SLICEM_F5LUT SLICEM_F6LUT

SLICEM_G5LUT SLICEM_G6LUT

SLICEM_H5LUT SLICEM_H6LUT

STARTUP STARTUP_STARTUP

SYSMONE1_SYSMONE1 SYSMON_IPAD1 SYSMON_IPAD2

TRISTATE_TX_BITSLICE

USR_ACCESS USR_ACCESS_USR_ACCESS

XADC_XADC

XIPHY_FEEDTHROUGH_BEL

如图所示，网表设计中的叶级单元可以映射到
对着目标部位打嗝。Bel按目标Xilinx设备上的站点分组，并且两个Bel
并且站点被分组为瓦片和clock_ region。每个bel也有映射到的bel_pins
单元上的引脚，并且是到网络网表对象的连接点。
您可以查询slr、tile、sites、cells、clock_regions或nets的bels。例如
get_bels-of[get_clock_regions X1Y3]
还可以查询bel对象的单元格、场地、分幅和bel_pins：
get_cells-of[get_bels SLICE_X104Y100/B6LUT]
属性
指定给bel对象的特性因TYPE而异。分配给BUFIO的属性
bel的类型如下，并带有示例值

Property Type Read-only Visible Value

CLASS string true true bel

CONFIG.DELAY_BYPASS.VALUES string true true FALSE, TRUE

IS_RESERVED bool true true 0

IS_TEST bool true true 0

IS_USED bool true true 0

NAME string true true BUFIO_X0Y25/BUFIO

NUM_BIDIR int true true 0

NUM_CONFIGS int true true 1

NUM_INPUTS int true true 1

NUM_OUTPUTS int true true 1

NUM_PINS int true true 2