UM0434 datasheet(271/390 Pages) STMICROELECTRONICS

Part #	UM0434

Description	The primary objective of this user?셲 manual is to describe

PDF	390 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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271 / 390 page

External core complex interfaces

UM0434

272/391

Figure 38 shows another sequence of read and write cycles. This example shows an

interleaved write access between two reads.

Figure 38.

Single-Cycle read, write, Read—Full pipelining

The first read request (addrx) is taken at the end of cycle C1 because the bus is idle. The

first write request (addry) is taken at the end of C2 because the first access is terminating

(addrx). Data for the addry write cycle is driven in C3, the cycle after the access is taken.

Also during C3, a request is generated for a read to addrz, which is taken at the end of C3

because the write access is terminating.

During C4, the addry write access is terminated, and no further access is requested.

nonseq

idle

addr x

addr y

addr z

single

data x

data z

data y

okay

m_clk

p_htrans

p_addr,p_hprot

p_hsize,

p_hbstrb, etc

p_hburst

p_hunalign

p_hwrite

p_hrdata

p_hwdata

p_hready

p_hresp

UM0434 Datasheet(PDF) 271 Page - STMicroelectronics