KS8695P-EVAL Micrel Inc, KS8695P-EVAL Datasheet - Page 20

• Manufacturer Part Number: KS8695P-EVAL
• Description: BOARD EVAL EXPERIMENT KS8695P
• Manufacturer: Micrel Inc

Specifications of KS8695P-EVAL

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 576-1002

KS8695P
Memory Interface
The KS8695P has a glueless interface for SDRAM and static
memory, i.e. ROM, SRAM, and Flash. It supports up to two
banks of static memory (Figure 7), up to two banks of SDRAM
(Figure 8), and three banks of external I/O (Figure 9). The
total address space for the KS8695P is 64MB. This includes
SDRAM, static memory, external I/O, and the KS8695P's own
64KB of register space.
The memory interface for the SDRAM and static memory has
a special automatic address mapping feature. This allows the
designer to connect address bit 0 on the memory to ADDR[0]
on the KS8695P and address bit 1 on the memory to ADDR[1]
on the memory, regardless of whether the designer is trying
to achieve word, half word, or byte addressing.
The KS8695P memory controller performs the address map-
ping internally. This permits the designer to use the maximum
amount of address bits, instead of losing one or two bits
because of address mapping. For external I/O, however,
the designer still needs to take care of the address mapping
(see Figure 9).
M9999-081805
Figure 7. Static Memory Interface Examples
KS8695P
KS8695P
ADDR[21:2]
ADDR[21:2]
DATA[15:0]
DATA[7:0]
ERWEN0
ERWEN0
EROEN
EROEN
RCSN0
ADDR0
RCSN0
ADDR0
ADDR1
ADDR1
V DD
20
20
16
8
A0
A1
A[21:2]
D[7:0]
CE
OE
WE
A0
A1
A[21:2]
D[15:0]
CE
OE
WE
BYTE
Half Word Wide
Static Memory
Static Memory
Byte Wide
20
KS8695P
KS8695P
Figure 8. SDRAM Interface Examples
ADDR[21..20]
ADDR[21..20]
ADDR[12..0]
ADDR[11..0]
DATA[15..0]
DATA[31..0]
SDQM[3..0]
SDOCLK
SDRASN
SDCASN
SDOCLK
SDRASN
SDCASN
SDCSN0
SDCSN0
SDQM0
SDQM1
SDWEN
SDWEN
SDICLK
SDICLK
SDCKE
SDCKE
16
32
13
12
4
2
2
CLK
CKE
DQ[15..0]
A[12..0]
BA[1..0]
CS#
RAS#
CAS#
LDQM
WE#
CLK
CKE
DQ[31..0]
A[11..0]
BA[1..0]
CS#
RAS#
CAS#
DQM[3..0]
WE#
UDQM
Half Word Wide
Word Wide
16M x 16
SDRAM
SDRAM
4M x 32
August 2005
Micrel