Cypress Semiconductor FX2LP Información técnica Pagina 214

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EZ-USB FX2 Technical Reference Manual
Page 10-24 EZ-USB FX2 Technical Reference Manual v2.1
LOGIC FUNCTION Register: This register is used only in DP State Instructions. It specifies the
inputs (TERMA and TERMB) and the Logic Function (LFUNC) to apply to those inputs. The result
of the logic function determines the State to which the GPIF will branch (see also “LENGTH /
BRANCH Register”, above).
TERMA and TERMB bits:
= 000: RDY0
= 001: RDY1
= 010: RDY2
= 011: RDY3
= 100: RDY4
= 101: RDY5 (or Transaction-Count Expiration, if GPIFREADYCFG.5 = 1)
= 110: FIFO flag (PF, EF, or FF), preselected via EPxGPIFFLGSEL
= 111: INTRDY (Bit 7 of the GPIFREADYCFG register)
LFUNC bits:
= 00: A AND B
= 01: A OR B
= 10: A XOR B
= 11: A
AND B
The TERMA and TERMB inputs are sampled at each rising edge of IFCLK. The logic function
is applied, then the branch is taken on the next rising edge.
This register is meaningful only for DP Instructions; when the DP bit of the OPCODE register
is cleared to 0, the contents of this register are ignored.
OUTPUT Register: This register controls the state of the 6 Control outputs (CTL5:0) during the
entire State defined by this State Instruction.
OEn Bit: If TRICTL = 1, specifies whether the corresponding CTLx output signal is tristated.
1 = Drive CTLx
0 = Tristate CTLx
CTLn Bit: specifies the state to set each CTLx signal to during this entire State.
1 = High level
If the CTLx bit in the GPIFCTLCFG register is set to 1, the output driver will be an
open-drain.
If the CTLx bit in the GPIFCTLCFG register is set to 0, the output driver will be driven
to CMOS levels.
0 = Low level
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