AN2505 Freescale Semiconductor / Motorola, AN2505 Datasheet - Page 5

• Manufacturer Part Number: AN2505
• Description: MSC8102 Asynchronous DSI Throughput
• Manufacturer: Freescale Semiconductor / Motorola

2.2.4 DSI Timing Values
The timing values associated with the preceding diagrams are listed in Table 1. These values are directly from the
MSC8102 Technical Data sheet and are based on T
are used to generate the theoretical throughput value in Section 3.
Freescale Semiconductor
100
101
102
103
104
105
106
107
108
109
110
No.
Attributes
Attributes
Read/Write data strobe deassertion width
• DCR[HTAAD] = 1
• DCR[HTAAD] = 0
Read data strobe deassertion to output data high impedance
Read data strobe assertion to output data active from high
impedance
Output data hold time after read data strobe deassertion
Read/Write data strobe assertion to HTA active from high
impedance
Output data valid to HTA assertion
Read/Write data strobe assertion to HTA valid
Read/Write data strobe deassertion to output HTA high
impedance.
(DCR[HTAAD] = 0, HTA at end of access released at logic 0)
Read/Write data strobe deassertion to output HTA
deassertion.
(DCR[HTAAD] = 1, HTA at end of access released at logic 1)
— Consecutive access to the same DSI
— Different device with DCR[HTADT] = 01
— Different device with DCR[HTADT] = 10
— Different device with DCR[HTADT] = 11
1
1
setup time before strobe (HWBS[n]) assertion
hold time after data strobe deassertion
HA[11–29]
HCID[0–4]
HD[0–63]
HWBSn
HRDS
HDST
Characteristics
HRW
HCS
Figure 4. DSI Asynchronous Broadcast Write Timings
MSC8102 Asynchronous DSI Throughput, Rev. 1
Table 1. DSI Asynchronous Mode Timing
100
2
106
REFCLK
112
201
, which is the local bus frequency. These timing values
5 + (1.5 × T
5 + (2.5 × T
1.8 + T
1.8 + T
5 + T
Asynchronous DSI Connections and Timings
202
Min
3.6
2.4
3.8
2.2
3.9
—
—
—
—
REFCLK
1
REFCLK
REFCLK
101
102
REFCLK
REFCLK
109
)
)
Max
7.8
9.8
6.5
9.2
—
—
—
—
—
—
—
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
5