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EMC646SP16JU-70L Datasheet(PDF) 7 Page - Emerging Memory & Logic Solutions Inc |
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EMC646SP16JU-70L Datasheet(HTML) 7 Page - Emerging Memory & Logic Solutions Inc |
7 / 65 page EMC646SP16J 4Mx16 CellularRAM 7 Preliminary Table 1 : PIN Descriptions Note: 1. When using asynchronous mode or page mode exclusively, CLK and ADV# inputs can be tied to Vss. WAIT will be asserted but should be ignored during asynchronous and page mode operations. Symbol Type Descriptions A[21:0] Input Address inputs: Inputs for addresses during READ and WRITE operations. Addresses are internally latched during READ and WRITE cycles. The address lines are also used to define the value to be loaded into the BCR or the RCR. CLK (Note1) Input Clock: Synchronizes the memory to the system operating frequency during synchronous operations. When configured for synchronous operation, the address is latched on the first rising CLK edge when ADV# is active. CLK is static LOW during asynchronous access READ and WRITE operations and during PAGE READ ACCESS operations. ADV# (Note1) Input Address valid: Indiates that a valid address is present on the address inputs. Addresses can be latched on the rising edge of ADV# during asynchronous READ and WRITE operations. ADV# can be held LOW during asynchronous READ and WRITE operations. CRE Input Control register enable: When CRE is HIGH, WRITE operations load the RCR or BCR, and READ operations access the RCR, BCR, or DIDR. CE# Input Chip enable: Activates the device when LOW. When CE# is HIGH, the device is disabled and goes into standby or deep power-down mode. OE# Input Output enable: Enables the output buffers when LOW. When OE# is HIGH, the output buffers are disabled. WE# Input Write enable: Determines if a given cycle is a WRITE cycle. If WE# is LOW, the cycle is a WRITE to either a configuration register or to the memory array. LB# Input Lower byte enable. DQ[7:0] UB# Input Upper byte enable. DQ[15:8] DQ[15:0] Input/Output Data inputs/outputs. WAIT (Note1) Output Wait: Provides data-valid feedback during burst READ and WRITE operations. The signal is gated by CE#. WAIT is used to arbitrate collisions between refresh and READ/WRITE operations. WAIT is also asserted at the end of a row unless wrapping within the burst length. WAIT is asserted and should be ignored during asynchronous and page mode operations. WAIT is High-Z when CE# is HIGH. RFU - Reserved for future use. Vcc Supply Device power supply: (1.70V.1.95V) Power supply for device core operation. VccQ Supply I/O power supply: (1.70V.1.95V) Power supply for input/output buffers. Vss Supply Vss must be connected to ground. VssQ Supply VssQ must be connected to ground. |
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