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型號(hào)：	79RC32V333-133DH
英文描述：	8-pin, 1.5KB Flash Program, 64B Flash Data, 8MHz Internal Oscillator, -40C to +85C, 8-SOIC 150mil, T/R
中文描述：	微處理器
文件頁(yè)數(shù)：	224/654頁(yè)
文件大?。?/td>	6963K
代理商：	79RC32V333-133DH

IDT DDR Controller

DDR Read Transaction

79RC32438 User Reference Manual

November 4, 2002

DDR Read Transaction

This section describes the DDR read transaction. All DDR read transactions consist of a burst read of an

even number of 16-bit/32-bit data quantities.

The transaction involves four programmable parameters:

Active to Read or Write Delay (

). RCD may be programmed to be any value between 1 and 4

DDR clock cycles.

CAS Latency (CL). CL may be programmed to values between 2 and 4 DDR clock cycles.

Precharge Delay (

). RP may be programmed to be any value between 1 and 4 DDR clock

Active to Precharge (ATP). ATP may be programmed to be any value between 5 and 8 DDR clock

When the auto precharge bit (AP) in the DDRC register is set, only the last read operation in the transac-

tion has the auto precharge address bit (i.e., DDRADDR[10] or DDRADDR[8] depending on the DDR type

and organization) address bit set. That is, only the last read operation performs an automatic precharge.

Figure 7.17 DDR SDRAM Read Transaction with Wrong Page Active in Bank (Bank Page Miss)

Description:

Refresh Queue Exceeded.

This bit is set to a one to indicate that the refresh queue limit of eight

refresh transactions has been exceeded and that a DDR refresh transaction has been discarded.

This bit should never be set under normal operation.

Initial Value:

(this field is not modified due to a warm reset)

Write Effect:

Sticky bit (a sticky bit is set by the hardware and can only be cleared by the CPU)

The programmable parameters shown in Figure 7.17 are for illustrative purposes only and may vary.

DDRADDR[13:0]

DDRDATA[Y:0]

1. Y = 31 in 32-bit mode, 15 in 16-bit mode. Refer to DBW bit in DDRC register for details.

2. DDRCMD represents the concatenation of DDRRASN, DDRCASN, and DDRWEN.

READ TRANSACTION

NEXT TRANSACTION

相關(guān)PDF資料	PDF描述
79RC32V333-133DHI	Microprocessor
79RC32V333-150DH	8 PIN, 1.75KB, FLASH, 64B RAM, COMPARATOR, 8MHZ INTERNAL OSCILLATOR, -40C to +125C, 8-PDIP, TUBE
79RC32V333-150DHI	Microprocessor
79RC32V334-100BB	MICROPROCESSOR\|32-BIT\|BGA\|256PIN\|PLASTIC
79RC32V334-100BBI	MICROPROCESSOR\|32-BIT\|BGA\|256PIN\|PLASTIC

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
79RC32V333-133DHI	制造商:未知廠家制造商全稱:未知廠家功能描述:Microprocessor
79RC32V333-150DH	制造商:未知廠家制造商全稱:未知廠家功能描述:Microprocessor
79RC32V333-150DHI	制造商:未知廠家制造商全稱:未知廠家功能描述:Microprocessor
79RC32V334-100BB	制造商:未知廠家制造商全稱:未知廠家功能描述:MICROPROCESSOR\|32-BIT\|BGA\|256PIN\|PLASTIC
79RC32V334-100BBG	制造商:Integrated Device Technology Inc 功能描述:MPU RC32300 32-Bit 100MHz 3.3V 256-Pin BGA

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