DS1877 datasheet(39/65 Pages) MAXIM

39 / 65 page

Maxim Integrated

SFP Controller for Dual Rx Interface

DS1877

Lower Memory, Register 7Fh: TABLE SELECT (TBL SEL)

Lower Memory, Registers 75h

–7Ah: RESERVED

Lower Memory, Registers 7Bh

–7Eh: PASSWORD ENTRY (PWE)

POWER-ON VALUE

00h

READ ACCESS

N/A

WRITE ACCESS

N/A

A2h AND B2h MEMORY

N/A

MEMORY TYPE

N/A

These registers are reserved. The value when read is 00h.

POWER-ON VALUE

FFFF FFFFh

READ ACCESS

N/A

WRITE ACCESS

All

A2h AND B2h MEMORY

Common A2h and B2h memory locations

MEMORY TYPE

Volatile

7Bh

231

230

229

228

227

226

225

224

7Ch

223

222

221

220

219

218

217

216

7Dh

215

214

213

212

211

210

7Eh

BIT 7

BIT 0

There are two passwords for the device. Each password is 4 bytes long. The lower level password (PW1) has all

the access of a normal user plus those made available with PW1. The higher level password (PW2) has all the

access of PW1 plus those made available with PW2. The values of the passwords reside in EEPROM inside PW2

memory. At power-up, all PWE bits are set to 1. All reads at this location are 0.

POWER-ON VALUE

TBLSELPON (Table 02h, Register C7h)

READ ACCESS

All

WRITE ACCESS

All

A2h AND B2h MEMORY

Different A2h and B2h memory locations

MEMORY TYPE

Volatile

7Fh

BIT 7

BIT 0

The upper memory tables of the device are accessible by writing the desired table value in this register. The power-

on value of this register is defined by the value written to TBLSELPON (Table 02h, Register C7h).

DS1877 Datasheet(PDF) 39 Page - Maxim Integrated Products

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