LX256VCF2085 datasheet(48/72 Pages) LATTICE

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Lattice Semiconductor

ispGDX2 Family Data Sheet

Power Consumption (Continued)

Power consumption in the ispGDX2 family is the sum of three components:

ICC-TOTAL = ICORE + IPLL + IHSI (ICC-TOTAL combines current supplied via VCC pins and VCCP pins)

ICORE =IDC + IREF + IIN

= Blank chip background current

+ KREF * Number of Banks with VREF active

+ (KIN * Number of inputs + KCORE) * Average Input Switching Frequency (MHz)

IPLL

=IPLL_D + IPLL_A

=[KPLLD * FVCO * Number of PLLs used] + [KPLLA * FVCO * Number of PLLs used]

= [(KPLLD + KPLLA) * FVCO] * Number of PLLs used

IHSI

=IRX + ITX

= [(KRXD + KRXA) * FRX + IRXSTBY] * Number of Receiver Channels

+ [(KTXD + KTXA) * FTX + ITXSTBY] * Number of Transmitter Channels

Where:

FVCO: sysClock PLL VCO Frequency in MHz

FRX:

sysHSI Receiver Serial Data Rate

FTX:

sysHSI Transmitter Serial Data Rate

IHSI can also be determined by calculating IHSI_D, the current supplied by the VCC pin, and IHSI_A, the current sup-

plied by the VCCP0 and VCCP1.

IHSI

=IHSI_D + IHSI_A

= [(KRXD * FRX + IRXSTBY)* Number of Receiver Channels

+ (KTXD * FTX + ITXSTBY) * Number of Transmitter Channels]

+[(KRXA * FRX) * Number of Receiver Channels

+ (KTXA * FTX) * Number of Transmitter Channels]

The ICCP is supplied through VCCP0 and VCCP1 pins for PLL and sysHSI analog portion. The equation for ICCP can

be derived from the equations below.

ICCP

=IPLL_A + IHSI_A

= [(KPLLA * FVCO) * Number of PLLs used]

+ [(KRXA * FRX) * Number of Receiver Channels

+ (KTXA * FTX) * Number of Transmitter Channels]

Where:

IPLL_A: PLL Analog Portion Current

IHSI_A: HSI Analog Portion Current

Note: For further information about the use of these coefﬁcients, refer to Technical Note TN1034, Power Estimation

in the ispGDX2 Family.

ICC-TOTAL estimates are based on typical conditions. These values are for estimates only. Since the value of ICC-

TOTAL is sensitive to operating conditions and the program in the device, the actual current should be veriﬁed.

LX256VCF2085 Datasheet(PDF) 48 Page - Lattice Semiconductor

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