CS7410 Datasheet, PDF (31/39 Pages) Cirrus Logic – CD/MP3/WMA Audio Controller

CS7410
68
SER2_CS
B Chip select for 4-wire serial port (output if master, input if
slave mode). Can also be used as bidirectional ready line.
69
SER3_CLK
O Clock output
70
SER3_DO
O Data output – up to 32 bits per transfer.
72
SER3_DI
I Data input – up to 96 bits per transfer.
74
SER3_SS0
O Slave select for first peripheral (programmable polarity)
76
SER3_SS1
O Slave select for second peripheral (programmable polar-
ity)
Table 9. Serial Interface Pins (Continued)
4.4 SDRAM / DRAM Interface
These pins are used to interface the CS7410 with external synchronous or EDO DRAMs. Data widths of 4
to 16 bits are supported. The CS7410 supports word or block transfers (partial word transfers are not re-
quired). Table 10 gives instructions on how to interface to any particular configuration of SDRAM. Table 11
gives pin definitions for interfacing to EDO DRAM.
Pin
Signal Name Type
Description
3, 4, 5, 6, 7, 8, 9,
10, 11, 13, 15, 20,
21, 22, 23, 24
DRAM
Data[15..0]
B Memory Data Bus.
25, 26, 27, 28,
29, 30, 31, 32,
33, 34, 35, 36
DRAM
O
Address[11..0]
Memory Address Bus. Connect in order starting with
DR_Addr[0] to all RAM address pins not already connected
to DR_BS_L or DR_AP.
37
DR_RAS_L
O
Memory Row Address Strobe
39
DR_CAS_L
O
Memory Column Address Strobe
41
M_WE_L
O
Memory Write Enable
43
DR_CKO
O
SDRAM Clock
45
DR_CKE
O
SDRAM Clock Enable
46
DR_BS_L
O
Bank Selection. Always connect to RAM BS or BS0 pin.
47
M_AP_OE
O
Memory Auto Pre-charge. Always connect to RAM AP pin.
Table 10. SDRAM Interface
Pin
Signal Name Type
Description
3, 4, 5, 6, 7, 8,
9, 10, 11, 13,
15, 20, 21, 22,
23, 24
DRAM
Data[15..0]
B Memory Data Bus.
Table 11. EDO DRAM Interface
DS553PP1
31