CS7808 datasheet(8/52 Pages) CIRRUS

No. de pieza	CS7808

Descripción Electrónicos	MULTI PURPOSE AUDIO/VIDEO EMBEDDED PROCESSOR

PDF	52 Pages

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Fabricante Electrónico	CIRRUS [Cirrus Logic]

Página de inicio	http://www.cirrus.com

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CS7808

1.2.2

SDRAM Interface

CS7808 interfaces with either SDRAM or SGRAM for high data bandwidth transfer. Figure 2 shows the

refresh cycle performed by CS7808. Figure 3 shows a burst write (length = 8) transaction. Figure 4 on

page 9 shows a burst read (length = 8) transaction, while Figure 5 on page 9 shows detailed SDRAM in-

terface timing. In both Figure 3 and Figure 4,CAS latencyis programmedto3.

Symbol

Description

Min

Typ

Max

Unit

tmsur

M_D[31:0] setup to M_CKO

tmhr

M_D[31:0] hold time after M_CKO

tmco

M_CKO active edge to Output transition

tmper

M_CKO Period1

1.Values are guaranteed by design only.

10.5

12.2

tmhw

M_D[31:0] valid time after M_CKO

tmdow

M_D[31:0] delay from M_CKO rising edge

Table 2. SDRAM Interface Characteristics

M_CKE

M_A_[11:0]

M_BS_N

M_RAS_N

M_CAS_N

M_WE_N

MD[31:0]

M_DQM_[3:0]

M_AP

Figure 2. SDRAM Refresh Transaction

M_CKO

M_A_[11:0]

M_BS_N

M_RAS_N

M_CAS_N

M_WE_N

M_D_[31:0]

M_DQM_[3:0]

M_AP

Figure 3. SDRAM Burst Write Transaction

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