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Technical Reference Guide
Compaq iPAQ Family of Internet Devices
First Edition - March 2000
4-9
4.3.1.1 Data Request
Requesting data is accomplished in one of two ways; either multiplexed addressing (using the
AD lines for addressing/data) or demultiplexed (“sideband”) addressing (using the SBA lines for
addressing only and the AD lines for data only). Even though there are only eight SBA lines (as
opposed to the 32 AD lines) sideband addressing maximizes efficiency and throughput by
allowing the AD lines to be exclusively used for data transfers. Sideband addressing occurs at
the same rate (1X or 2X) as data transfers. The differences in rates will be discussed in the next
section describing data transfers. Note also that sideband addressing is limited to 48 bits (address
bits 48-63 are assumed zero). The GMCH and MCH components support both SBA and AD
addressing, but the method and rate is selected by the AGP graphics adapter.
4.3.1.2 Data Transfers
Data transfers use the AD lines and occur as the result of data requests described previously.
Each transaction resulting from a request involves at least eight bytes, requiring the 32 AD lines
to handle at least two transfers per request. The 82810e MCH supports two transfer rates: 1X and
2X. Regardless of the rate used, the speed of the bus clock is constant at 66 MHz. The following
subsections describe how the use of additional strobe signals makes possible higher transfer rates.
AGP 1X Transfers
During a AGP 1X transfer the 66-MHz CLK signal is used to qualify the control and data
signals. Each 4-byte data transfer is synchronous with one CLK cycle so it takes two CLK cycles
for a minimum 8-byte transfer (Figure 4-4 shows two 8-byte transfers). The GNT- and TRDY-
signals retain their traditional PCI functions. The ST0..3 signals are used for priority encoding,
with “000” for low priority and “001” indicating high priority. The signal level for AGP 1X
transfers may be 3.3 or 1.5 VDC.
Figure 4-4.
AGP 1X Data Transfer (Peak Transfer Rate: 266 MB/s)
T1 T2 T
3
T4 T5
T6
T7
TRDY
-
GNT
-
CLK
AD
D1A
D2A
D2B
D1B
ST0..2
00x
xxx
xxx
xxx
xxx
xxx