HYB25L256160AF Datasheet, PDF (9/56 Pages) Infineon Technologies AG – 256MBit Mobile-RAM

HY[B/E]25L256160AF–7.5
256MBit Mobile-RAM
Pin Configuration
Table 3 Input/Output Signals
Pin Symbol Type Polarity Function
F2 CLK
Input
Positive Clock
Edge The system clock input. All of the SDRAM inputs are sampled on the rising edge
of the clock.
F3 CKE
Input
Active
High
Clock Enable
CKE activates the CLK signal when high and deactivates the CLK signal when
low, thereby initiates either the Power Down mode, Suspend mode, or the Self
Refresh mode.
G9 CS
Input
Active
Low
Chip Select
CS enables the command decoder when low and disables the command
decoder when high. When the command decoder is disabled, new commands
are ignored but previous operations continue.
F8 RAS
F7 CAS
F9 WE
Input
Active
Low
Command Inputs
Sampled at the rising edge of the clock, RAS, CAS, and WE (along with CS)
define the command to be executed by the SDRAM.
G8 BA1
G7 BA0
Input
Active
High
Bank Address Inputs
BA0 and BA1 define to which bank an Active, Read, Write or Precharge
command is being applied. BA0 and BA1 also determine if the mode register or
extended mode register is to be accessed during a MRS or EMRS cycle.
G1 A12 Input
G2 A11
H9 A10/AP
G3 A9
H1 A8
H2 A7
H3 A6
J2 A5
J3 A4
J7 A3
J8 A2
Active
High
Address Inputs
During a Bank Activate command cycle, A12 - A0 define the row address
(RA12 - RA0) when sampled at the rising clock edge.
During a Read or Write command cycle, A8-A0 define the column address
(CA8 - CA0) when sampled at the rising clock edge.
In addition to the column address, A10/AP is used to invoke autoprecharge
operation at the end of the burst read or write cycle. If AP is high, autoprecharge
is selected and BA1, BA0 defines the bank to be precharged. If AP is low,
autoprecharge is disabled.
During a Precharge command cycle, AP is used in conjunction with BA1 and
BA0 to control which bank(s) to precharge. If AP is high, all four banks will be
precharged regardless of the state of BA0 and BA1. If AP is low, then BA1 and
BA0 are used to define which bank to precharge.
H8 A1
H7 A0
Data Sheet
9
Rev. 1.2, 04-2004