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SNC 4000 User’s Guide
145
Memory Size
Figure 14
Memory Size
This test verifies that the apparent size of SDRAM meets the minimum and maximum sizes specified for the
product. This test is identified by the flash of the
FC
and
S1 LED
s.
Pattern Test
Figure 15
Pattern Test
This test writes and reads a series of diagnostic patterns to each memory location in SDRAM. This test is
identified by the repeated flash of the
S2
LED. This test can take several seconds to complete.
Address Test
Figure 16
Address Test
This test writes and reads address tags to memory to test for bad SDRAM address lines. This test is
identified by the flash of the
FC
and
S2
LED. POST then relocates itself to SDRAM and moves its stack from
processor internal RAM to SDRAM. Control is then transferred to the SDRAM-based secondary POST.
IpostMain
starts by initializing the service-port and the system PLD(s). The
ERR
LED will extinguish and
the
RDY
LED will turn on. POST will display the following message on the service port:
Secondary POST
This stage of POST attempts to locate and execute the intermediate loader, or “bootrom”. If the operator
presses the interrupt button then POST will enter into the service menu. See the section “POST Service
Menu” for details.
Summary of Contents for SNC 4000
Page 1: ...www adic com ADICSNC 4000User sGuide ADVANCED DIGITAL INFORMATION CORPORATION...
Page 10: ...4 SNC 4000 Introduction...
Page 40: ...34 Removal and Replacement Procedures...
Page 140: ...134 Service Port Command Reference...
Page 147: ...SNC 4000 User s Guide 141 fcConnPortModeGet...
Page 148: ...142 Diagnostic Command Reference...