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GC2011A Datasheet(PDF) 26 Page - Texas Instruments |
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GC2011A Datasheet(HTML) 26 Page - Texas Instruments |
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26 / 50 page  Texas Instruments Incorporated - 22 - GC2011A 3.3V DIGITAL FILTER CHIP SLWS129A This document contains information which may be changed at any time without notice 3.10 DIAGNOSTICS The user can use the ramp input and the snapshot memory to perform diagnostics on the chip. The suggested diagnostic procedure is to configure the chip as it will be used in normal operation, but to select the ramp as the data input source (see Section 6.1), to set the counter control to 0FFF HEX (see Section 6.4), and to set the snapshot controls to capture 128 output samples (see Section 6.7). The snapshot should be triggered on TC with a delay of 4 blocks from trigger. The delay guarantees that the filter has flushed and settled out before the snapshot is taken. The user can then read the snapshot from memory and compare it against a known snapshot or save it for future comparison. Two suggested diagnostic configurations are given below along with the expected snapshot output. These configurations use all of the coefficient registers and all of the forward and reverse delay storage registers. The diagnostic procedure is, for each test configuration in table 11: (1) Load the 11 control registers with the values shown in Table 11. (2) Load the coefficients h(k) in addresses 128+k for k=0 to 127. (3) Set the start bit in the snapshot register by writing 0413HEX to address 10. (4) Wait, while reading address 10, until the register value is 0463HEX. (5) Read addresses 256 through 271 and 384 through 399 and compare them to the expected values in Table 12 . Table 11: Diagnostic Test Configuration Parameter Address Test A Test B h(k) k modulo 4 = 0 EAAA 1555 k modulo 4 = 1 FFFF E000 k modulo 4 = 2 0F0F F0F0 k modulo 4 = 3 0001 1FFF A_PATH_REG0 0 C402 E402 A_PATH_REG1 1 0292 0108 B_PATH_REG0 2 D402 E402 B_PATH_REG1 3 0214 02F2 CASCADE 4 1000 2F00 COUNTER 5 0FFF 0FFF GAIN 6 1035 103A OUTPUT 7 0041 0041 SNAP_REGA 8 004E 004F SNAP_REGB 9 004F 005F SNAP_REGC 10 0403 0403 NEW_MODES 12 0000 0000 Table 12: Expected Test Results Address Test A Test B Address Test A Test B Address Test A Test B Address Test A Test B 256 C302 A635 264 C621 C3D3 384 3BC2 4BAD 392 3CC2 4A33 257 C2E2 A606 265 CA1F C8BD 385 3BE2 4B7E 393 3CE2 4A04 258 C2C2 A5D7 266 CE1E CDA6 386 3C02 4B4F 394 3D02 49D4 259 C2A2 A5A8 267 D21D D290 387 3C22 4B1F 395 3D22 49A5 260 C282 A578 268 D61B F692 388 3C42 4AF0 396 3D41 4976 261 C262 A549 269 DA1A 0094 389 3C62 4AC1 397 3D61 4947 262 C243 A51A 270 DE19 0A97 390 3C82 4A91 398 3D81 4917 263 C223 A4EA 271 E217 1499 391 3CA2 4A62 399 3DA1 48E8 |
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