Cypress Semiconductor CYV15G0404DXB Guia do Utilizador descarregar pdf (Página 14)

CYV15G0404DXB Evaluation Board

Users Guide

Page 14 of 56

Table 5-3 provides a brief description of the control latches for the configuration interface. For a detailed description, please refer

to the datasheet. When a signal has multiple bits (e.g., RFMODEx[1:0] = 10), the right-most bit is the LSB (bit 0).

Table 5-2. Description of External Control Pins for Connectors J31 to J41

Pin Name Characteristics

SPDSELA (J34)

SPDSELB (J33)

SPDSELC (J32)

SPDSELD (J31)

Serial Rate Select

3-Level Select

• LOW = 195–400 MBd

• MID = 400–800 MBd

• HIGH = 800–1500 MBd

LDTDEN (J38) Level Detect Transition Density Enable

• When HIGH, the Signal Level Detector, Range Controller, and Transition Density Detector are all

enabled

• When LOW, only the Range Controller is enabled

LTEN1 (J37) Factory Test 1

• This input should be HIGH

SCANEN2(J36) Factory Test 2

• This input should be left open or LOW

TMEN3(J35) Factory Test 3

• This input should be left open or LOW

WREN

(J39) Control Write Enable Header

• When the jumper is connected across the middle and right pins (see Figure 6-3 on page 17), the

push-button signal controls the WREN

input to the chip

• When the jumper is connected across the middle and left pins, WREN

is permanently ACTIVE (LOW)

RESET(J40) Asynchronous Global Reset Header

• When HIGH, the push-button signal controls the RESET

input to the chip

• When LOW, RESET

is permanently ACTIVE (LOW)

JTAG RESET(J41) Asynchronous JTAG Reset Header

• When closed, the global RESET

signal will reset the JTAG interface

• When open, the global RESET

signal has no effect on the JTAG interface

Table 5-3. Device Control Latch Description

Pin Name Characteristics

RFMODEx[1:0] Reframe Mode Select

• When RFMODEx[1:0] = 00, low-latency framer is selected

• When RFMODEx[1:0] = 01, alternate mode Multi-byte framer is selected

• When RFMODEx[1:0] = 10, Cypress-mode Multi-byte framer is selected

• RFMODEx[1:0] = 11 is reserved for test

FRAMCHARx Framing Character Select

• When 1, framer looks for either disparity of the K28.5 character

• When 0, framer looks for either disparity of the 8-bit Comma characters

DECMODEx Receiver Decoder Mode Select

• When 1, the Cypress Decoding Mode is used

• When 0, the Alternate Decoding Mode is used

DECBYPx Receiver Decoder Bypass

• When 1, the decoder is enabled

• When 0, the decoder is bypassed and raw 10-bit characters are passed through

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