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SSTUH32866 데이터시트(PDF) 9 Page - NXP Semiconductors |
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SSTUH32866 데이터시트(HTML) 9 Page - NXP Semiconductors |
9 / 28 page 9397 750 14199 © Koninklijke Philips Electronics N.V. 2005. All rights reserved. Product data sheet Rev. 01 — 13 May 2005 9 of 28 Philips Semiconductors SSTUH32866 1.8 V high-drive DDR2 configurable registered buffer with parity cascaded to the PAR_IN of the second register. The QERR output of the first register is left floating and the valid error information is latched on the QERR output of the second register. If an error occurs and the QERR output is driven LOW, it stays latched LOW for two clock cycles or until RESET is driven LOW. The DIMM-dependent signals (DCKE, DCS, DODT, and CSR) are not included in the parity check computation. The device supports low-power standby operation. When RESET is LOW, the differential input receivers are disabled, and undriven (floating) data, clock and reference voltage (VREF) inputs are allowed. In addition, when RESET is LOW all registers are reset, and all outputs are forced LOW. The LVCMOS RESET input must always be held at a valid logic HIGH or LOW level. The device also supports low-power active operation by monitoring both system chip select (DCS and CSR) inputs and will gate the Qn and PPO outputs from changing states when both DCS and CSR inputs are HIGH. If either DCS or CSR input is LOW, the Qn and PPO outputs will function normally. The RESET input has priority over the DCS and CSR control and when driven LOW will force the Qn and PPO outputs LOW, and the QERR output HIGH. If the DCS control functionality is not desired, then the CSR input can be hard-wired to ground, in which case, the setup time requirement for DCS would be the same as for the other Dn data inputs. To control the low-power mode with DCS only, then the CSR input should be pulled up to VDD through a pull-up resistor. To ensure defined outputs from the register before a stable clock has been supplied, RESET must be held in the LOW state during power-up. In the DDR2 RDIMM application, RESET is specified to be completely asynchronous with respect to CK and CK. Therefore, no timing relationship can be guaranteed between the two. When entering reset, the register will be cleared and the Qn outputs will be driven LOW quickly, relative to the time to disable the differential input receivers. However, when coming out of reset, the register will become active quickly, relative to the time to enable the differential input receivers. As long as the data inputs are LOW, and the clock is stable during the time from the LOW-to-HIGH transition of RESET until the input receivers are fully enabled, the design of the SSTUH32866 must ensure that the outputs will remain LOW, thus ensuring no glitches on the output. |
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