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AS4C128M8D3 Datasheet(PDF) 6 Page - Alliance Semiconductor Corporation |
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AS4C128M8D3 Datasheet(HTML) 6 Page - Alliance Semiconductor Corporation |
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6 / 85 page  AS4C128M8D3 Confidential 6 Rev. 3.0 Aug. /2014 Ball Descriptions Table 3. Ball Descriptions Symbol Type Description CK, CK# Input Differential Clock: CK and CK# are driven by the system clock. All SDRAM input signals are sampled on the crossing of positive edge of CK and negative edge of CK#. Output (Read) data is referenced to the crossings of CK and CK# (both directions of crossing). CKE Input Clock Enable: CKE activates (HIGH) and deactivates (LOW) the CK signal. If CKE goes LOW synchronously with clock, the internal clock is suspended from the next clock cycle and the state of output and burst address is frozen as long as the CKE remains LOW. When all banks are in the idle state, deactivating the clock controls the entry to the Power Down and Self Refresh modes. BA0-BA2 Input Bank Address: BA0-BA2 define to which bank the BankActivate, Read, Write, or BankPrecharge command is being applied. A0-A13 Input Address Inputs: A0-A13 are sampled during the BankActivate command (row address A0-A13) and Read/Write command (column address A0-A9 with A10 defining Auto Precharge). A10/AP Input Auto-Precharge: A10 is sampled during Read/Write commands to determine whether Autoprecharge should be performed to the accessed bank after the Read/Write operation. (HIGH: Autoprecharge; LOW: no Autoprecharge). A10 is sampled during a Precharge command to determine whether the Precharge applies to one bank (A10 LOW) or all banks (A10 HIGH). A12/BC# Input Burst Chop: A12/BC# is sampled during Read and Write commands to determine if burst chop (on the fly) will be performed. (HIGH - no burst chop; LOW - burst chopped). CS# Input Chip Select: CS# enables (sampled LOW) and disables (sampled HIGH) the command decoder. All commands are masked when CS# is sampled HIGH. It is considered part of the command code. RAS# Input Row Address Strobe: The RAS# signal defines the operation commands in conjunction with the CAS# and WE# signals and is latched at the crossing of positive edges of CK and negative edge of CK#. When RAS# and CS# are asserted "LOW" and CAS# is asserted "HIGH," either the BankActivate command or the Precharge command is selected by the WE# signal. When the WE# is asserted "HIGH," the BankActivate command is selected and the bank designated by BA is turned on to the active state. When the WE# is asserted "LOW," the Precharge command is selected and the bank designated by BA is switched to the idle state after the precharge operation. CAS# Input Column Address Strobe: The CAS# signal defines the operation commands in conjunction with the RAS# and WE# signals and is latched at the crossing of positive edges of CK and negative edge of CK#. When RAS# is held "HIGH" and CS# is asserted "LOW," the column access is started by asserting CAS# "LOW." Then, the Read or Write command is selected by asserting WE# “HIGH " or “LOW". WE# Input Write Enable: The WE# signal defines the operation commands in conjunction with the RAS# and CAS# signals and is latched at the crossing of positive edges of CK and negative edge of CK#. The WE# input is used to select the BankActivate or Precharge command and Read or Write command. DQS, DQS# Input / Output Bidirectional Data Strobe: Specifies timing for Input and Output data. Read Data Strobe is edge triggered. Write Data Strobe provides a setup and hold time for data and DM. The data strobes DOS is paired with DQS# to provide differential pair signaling to the system during both reads and writes. TDQS TDQS# Output Termination Data Strobe: When TDQS is enabled, DM is disabled, and the TDQS and TDQS# balls provide termination resistance. |
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