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EDB8164B4PR-1DATF-R 数据表(PDF) 40 Page - Micron Technology |
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EDB8164B4PR-1DATF-R 数据表(HTML) 40 Page - Micron Technology |
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40 / 152 page ![]() 4. If ZQ is connected to VSS through RZQ, either the ZQ calibration function (see MODE REGISTER WRITE command) or default calibration (through the ZQRESET command) is supported. If ZQ is connected to VDD2, the device operates with default calibration, and ZQ calibration commands are ignored. In both cases, the ZQ connection must not change after power is supplied to the device. 5. LPDDR2 devices that do not support calibration shall ignore the ZQ Calibration com- mand. 6. Optionally, the MRW ZQ Initialization Calibration command will update MR0 to indicate RZQ pin connection. Table 36: MR[11:15] Reserved (MA[7:0] = 0Bh–0Fh) OP7 OP6 OP5 OP4 OP3 OP2 OP1 OP0 Reserved Table 37: MR16 PASR Bank Mask (MA[7:0] = 010h) OP7 OP6 OP5 OP4 OP3 OP2 OP1 OP0 Bank mask (4-bank or 8-bank) Table 38: MR16 Op-Code Bit Definitions Feature Type OP Definition Bank[7:0] mask Write-only OP[7:0] 0b: refresh enable to the bank = unmasked (default) 1b: refresh blocked = masked Note: 1. For 4-bank devices, only OP[3:0] are used. Table 39: MR16 Bank and OP corresponding table Feature Type OP 4-Bank Mask 8-Bank Mask Bank # Bank Address Bank # Bank Address Bank[7:0] mask Write-only 0 Bank 0 000b Bank 0 000b 1 Bank 1 001b Bank 1 001b 2 Bank 2 010b Bank 2 010b 3 Bank 3 011b Bank 3 011b 4 – – Bank 4 100b 5 – – Bank 5 101b 6 – – Bank 6 110b 7 – – Bank 7 111b Note: 1. Each bank can be masked independently by setting each OP value. 216-Ball and 220-Ball, Dual-Channel LPDDR2 SDRAM Mode Register Definition 09005aef85eb530a 216b_220b_2ch_2e0e_embedded_lpddr2.pdf – Rev. F 08 /16 EN 40 Micron Technology, Inc. reserves the right to change products or specifications without notice. © 2014 Micron Technology, Inc. All rights reserved. |
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