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H5GQ2H24AFR-R0C 数据表(PDF) 98 Page - Hynix Semiconductor |
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H5GQ2H24AFR-R0C 数据表(HTML) 98 Page - Hynix Semiconductor |
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98 / 172 page ![]() This document is a general product description and is subject to change without notice. Hynix Semiconductor does not assume any responsability for use of circuits described. No patent licenses are implied. Rev. 1.2 /Nov. 2011 98 H5GQ2H24AFR 5.10. DQ PREAMBLE DQ preamble is a feature for GDDR5 SGRAMs that is used for READ data. DQ preamble conditions the DQs for better signal integrity on the initial data of a burst. Once enabled by bit 5 in MR7, the DQ preamble will precede all READ bursts, including non‐consecutive READ bursts with a minimum gap of 1 tCK, as shown in Figure 59. When enabled, the DQ preamble pat‐ tern applies to all DQ and DBI# pins in a byte, and the same pattern is used for all bytes as shown in Figure63. DQ preamble is enabled or disabled for all bytes. The EDC pin in each byte is not included in the DQ preamble. If ODT is enabled, the ODT is disabled 1 tCK before the start of the preamble pattern as shown in Figure 64. The preamble pattern on the DBI# pin is only enabled if the MR for RDBI is enabled (MR1 A8 bit). During the preamble the DBI# pin is treated as another DQ pin and the preamble pattern on the DQs is not encoded with RDBI. If RDBI is disabled, then the DBI# pin drives ODT. Notes: 1) The number of Max 0’s in the burst is 4 only if RDBI is enabled. Max 0‘s is on a per byte basis and does not include the EDC pin. 2) x = Valid Data Figure 63. DQ Preamble Pattern Byte 0 Byte 1 Byte 2 Byte 3 Idle Preamble Burst DQ7 DQ15 DQ23 DQ31 1 1 1 1 0 1 0 1 x x x x x x x x DQ6 DQ14 DQ22 DQ30 1 1 1 1 1 0 1 0 x x x x x x x x DQ5 DQ13 DQ21 DQ29 1 1 1 1 0 1 0 1 x x x x x x x x DQ4 DQ12 DQ20 DQ28 1 1 1 1 1 0 1 0 x x x x x x x x DQ3 DQ11 DQ19 DQ27 1 1 1 1 0 1 0 1 x x x x x x x x DQ2 DQ10 DQ18 DQ26 1 1 1 1 1 0 1 0 x x x x x x x x DQ1 DQ9 DQ17 DQ25 1 1 1 1 0 1 0 1 x x x x x x x x DQ0 DQ8 DQ16 DQ24 1 1 1 1 1 0 1 0 x x x x x x x x DBI0# DBI1# DBI2# DBI3# 1 1 1 1 0 1 0 1 x x x x x x x x Max 0’s 0 0 0 0 5 4 5 4 4 4 4 4 4 4 4 4 Time |
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