PM6344 datasheet(189/256 Pages) PMC

189 / 256 page

STANDARD PRODUCT

PMC-Sierra, Inc.

PM6344 EQUAD

PMC-951013

ISSUE 5

QUADRUPLE E1 FRAMER

176

TEST FEATURES DESCRIPTION

Simultaneously asserting the CSB, RDB and WRB inputs causes all output pins

and the data bus to be held in a high-impedance state. This test feature may be

used for board testing.

Test mode registers are used to apply test vectors during production testing of

the EQUAD. Test mode registers (as opposed to normal mode registers) are

mapped into addresses 200H-3FFH.

Test mode registers may also be used for board testing. When all of the

constituent Telecom System Blocks within the EQUAD are placed in test mode 0,

device inputs may be read and device outputs may be forced via the

microprocessor interface (refer to the section "Test Mode 0" for details).

Notes on Test Mode Register Bits:

1. Writing values into unused register bits has no effect. Reading unused bits

can produce either a logic 1 or a logic 0; hence unused register bits should be

masked off by software when read.

2. Writeable test mode register bits are not initialized upon reset unless

otherwise noted.

11.1 Test Mode 0

In test mode 0, the EQUAD allows the logic levels on the device inputs to be read

through the microprocessor interface, and allows the device outputs to be forced

to either logic level through the microprocessor interface.

To enable test mode 0, the IOTST bit in the Test Mode Select Register is set to

logic 1 and the following addresses must be written with 00H: 211H, 219H,

21DH, 221H, 231H, 235H, 239H, 241H, 245H, 291H, 299H, 29DH, 2A1H, 2B1H,

2B5H, 2B9H, 2C1H, 2C5H, 311H, 319H, 31DH, 321H, 331H, 335H, 339H, 341H,

345H, 391H, 399H, 39DH, 3A1H, 3B1H, 3B5H, 3B9H, 3C1H, and 3C5H. Also, to

enable input and output signals to propagate through the interface blocks, the

value 00H must be written to addresses 001H, 002H, 003H, 004H, 081H, 082H,

083H, 084H, 101H, 102H, 103H, 104H, 181H, 182H, 183H, and 184H. The

value 02H must be written to addresses 007H, 087H, 107H, and 187H.

Reading the following address locations returns the values for the indicated

inputs :

PM6344 Datasheet(PDF) 189 Page - PMC-Sierra, Inc