
Introduction
77
December 2003 Revised March 2005
SPRS231D
2.4
Signal Description
Table 25 provides a description of the signals on OMAP5912. Many signals are available on multiple pins,
depending upon the software configuration of the pin multiplexing options.
Table 25. Signal Descriptions
SIGNAL
ZDY
BALL#
ZZG
BALL#
DESCRIPTION
TYPE
EXTERNAL MEMORY INTERFACE FAST (EMIFF) SDRAM INTERFACE
SDRAM.CS
E7
G8
SDRAM chip-select
O
SDRAM.DQSH
A12
C14
DDR DQ strobe high
I/O
SDRAM.DQSL
A2
D4
DDR DQ strobe low
I/O
SDRAM.CAS
D5
B4
SDRAM column address strobe. SDRAM.CAS is active (low) during reads,
writes, and the REFR and MRS commands to SDRAM memory.
O
SDRAM.DQML
C7
C8
SDRAM lower data mask. Active-high data mask for the lower byte of the
SDRAM data bus (SDRAM.D[7:0]). The data mask outputs allow for both
16-bit-wide and 8-bit-wide accesses to SDRAM memory.
O
SDRAM.DQMU
A8
D10
SDRAM upper data mask. Active-high data mask for the upper byte of the
SDRAM data bus (SDRAM.D[15:8]). The data mask outputs allow for both
16-bit-wide and 8-bit-wide accesses to SDRAM memory.
O
SDRAM.RAS
D4
H7
SDRAM row address strobe. SDRAM.RAS is active (low) during ACTV,
DCAB, REFR, and MRS commands to SDRAM memory.
O
SDRAM.WE
E6
H8
SDRAM write enable. SDRAM.WE is active (low) during writes, DCAB, and
MRS commands to SDRAM memory.
O
SDRAM.A[13:0]
D10 E8
E9 F8
F9 C6
A10 E10
C8 D9
C3 F7
A1 B2
H11 H9
H10 B8
B12 G9
G11 G12
B9 G10
A1 B6
B2 A2
SDRAM address bus. Provides row and column address information to the
SDRAM memory as well as MRS command data. SDRAM.A[10] also serves
as a control signal to define specific commands to SDRAM memory.
O
SDRAM.BA[1:0]
C4 C5
C3 B3
SDRAM bank address bus. Provides the bank address to SDRAM memories
O
SDRAM.D[15:0]
B10 C10
B11 B9
A11 B8
B12 C9
B7 A3
B6 B3
A5 A4
B5 B4
C12 D12
D13 C11
C13 D11
D14 C10
D8 C4
C7 D5
D7 C5
C6 D6
SDRAM data bus. SDRAM.D[15:0] provides data exchange between the
traffic controller and SDRAM memory.
I/O
SDRAM.CLK
A7
C9
SDRAM clock. Clock for synchronization SDRAM memory
commands/accesses.
O
SDRAM.CLKX
A6
D9
DDR clock. Inverted clock for synchronization DDR memory
commands/accesses
O
SDRAM.CKE
B13
H12
SDRAM clock enable (active-high). Asserting this signal enables the
SDRAM clock for normal operation; negating puts SDRAM memory into
low-power mode.
O
I = Input, O = Output, Z = High-Impedance